Publications - Jorge Picado

Research Papers
  1. Frobenius identities and geometrical aspects of Joyal-Tierney theorem (with Aleš Pultr)
         Topology and its Applications 358 (2024) 1-12.

  2. Notes on sublocales and dissolution (with Aleš Pultr)
         Quaestiones Mathematicae 47 (2024) 2053-2067.

  3. Notes on the spatial part of a frame (with Igor Arrieta and Aleš Pultr)
         Categories and General Algebraic Structures with Applications 20 (2024) 105-129 (special issue in honour of Themba Dube).

  4. Some properties of conjunctivity (subfitness) in generalized settings (with M. Andrew Moshier and Aleš Pultr)
         Quaestiones Mathematicae 46:sup1 (2023) 239-252 (special issue dedicated to the memory of Horst Herrlich).

  5. Frame presentations of compact hedgehogs and their properties (with Igor Arrieta and Javier Gutiérrez García)
         Quaestiones Mathematicae 46 (2023) 207-242.
         Review (MR, zbMATH)

  6. Uniform continuity of pointfree real functions via farness and related Galois connections (with Ana Belén Avilez)
         Algebra Universalis 83 (2022) 1-27, Article number: 39.

  7. Uniformities and a quantale structure on localic groups (with Aleš Pultr)
         Bulletin of the Belgian Mathematical Society - Simon Stevin 28 (2022) 561-578.
         Review (MR, zbMATH)

  8. Adjoint maps between implicative semilattices and continuity of localic maps (with Marcel Erné and Aleš Pultr)
         Algebra Universalis 83 (2022) 1-23, Article number: 13.
         Review (zbMATH)

  9. A new diagonal separation and its relations with the Hausdorff property (with Igor Arrieta and Aleš Pultr)
         Applied Categorical Structures 30 (2022) 247-263.
         Review (zbMATH)

  10. Some general aspects of exactness and strong exactness of meets (with M. Andrew Moshier and Aleš Pultr)
         Topology and its Appplications 389 (2022) 1-14, Article number: 107906.
         Review (MR)

  11. Continuous extensions of real functions on arbitrary sublocales and C-, C*-, and z-embeddings (with Ana Belén Avilez)
         Journal of Pure and Applied Algebra 225 (2021) 1-24, Article number: 106702.
         Review (MR, zbMATH)

  12. On equalizers in the category of locales (with Aleš Pultr)
         Applied Categorical Structures 29 (2021) 267–283 (free access to a full-text view-only file here).
         Review (MR)

  13. Hewitt's irresolvability and induced sublocales in spatial frames (with Dharmanand Baboolal, Paranjothi Pillay and Aleš Pultr)
         Quaestiones Mathematicae 43 (2020) 1601-1612.

  14. Perfect locales and localic real functions (with Javier Gutiérrez García and Tomasz Kubiak)
         Algebra Universalis 81 (2020) 1-18, Article number: 32.
         Review (MR)

  15. On hereditary properties of extremally disconnected frames and normal frames (with Javier Gutiérrez García and Tomasz Kubiak)
         Topology and its Applications 273 (2020) 1-15, Article number: 106978.
         Review (MR)

  16. Axiom TD and the Simmons sublocale theorem (with Aleš Pultr)
         Commentationes Mathematicae Universitatis Carolinae 60 (2019) 541-551 (special issue in honour of Věra Trnková).
         Review (MR)

  17. Another proof of Banaschewski's surjection theorem (with Dharmanand Baboolal and Aleš Pultr)
         Categories and General Algebraic Structures with Applications 11 (2019) 113-130 (special issue in honour of George A. Grätzer).
         Review (zbMATH)

  18. Hedgehog frames and a cardinal extension of normality (with Javier Gutiérrez García, Imanol Mozo Carollo and Joanne Walters-Wayland)
         Journal of Pure and Applied Algebra 223 (2019) 2345-2370.
         Review (MR)

  19. Joins of closed sublocales (with Aleš Pultr and Anna Tozzi)
         Houston Journal of Mathematics 45 (2019) 21-38.
         Review (MR)

  20. Some aspects of (non)functoriality of natural discrete covers of locales (with Richard N. Ball and Aleš Pultr)
         Quaestiones Mathematicae 42 (2019) 701-715.
         Review (MR)

  21. Entourages, density, Cauchy maps, and completion (with Aleš Pultr)
         Applied Categorical Structures 26 (2018) 1305-1324.
         Review (MR)

  22. Remainders in pointfree topology (with Maria João Ferreira and Sandra Pinto)
         Topology and its Applications 245 (2018) 21-45.
         (Errata: in the formula after (4.2) there is a misprint, the containment is in the wrong direction, it should be: int (L \ A) ⊇ L \ cl A.)

  23. The other closure and complete sublocales (with Maria Manuel Clementino and Aleš Pultr)
         Applied Categorical Structures 26 (2018) 891-908.

  24. Tensor products and relation quantales (with Marcel Erné)
         Algebra Universalis 78 (2017) 461–487.
         Review (MR)

  25. A Boolean extension of a frame and a representation of discontinuity (with Aleš Pultr)
         Quaestiones Mathematicae 40 (2017) 1111-1125.
         Review (MR)

  26. Generating sublocales by subsets and relations: a tangle of adjunctions (with M. Andrew Moshier and Aleš Pultr)
         Algebra Universalis 78 (2017) 105-118.
         Review (MR)

  27. Perfectness in locales (with J. Gutiérrez García and Tomasz Kubiak)
         Quaestiones Mathematicae 40 (2017) 507-518.
         Review (MR)

  28. Localic maps constructed from open and closed parts (with Aleš Pultr)
         Categories and General Algebraic Structures with Applications 6 (2017) 21-35.
         (volume dedicated to the 90th birthday of Bernhard Banaschewski)
         Review (MR)

  29. New aspects of subfitness in frames and spaces (with Aleš Pultr)
         Applied Categorical Structures 24 (2016) 703-714.
         Review (MR, zbMATH)

  30. A unified view of the Dedekind completion of point-free function rings (with J. Gutiérrez García and I. Mozo Carollo)
         Quaestiones Mathematicae 39 (2016) 991-1003.
         Review (MR)

  31. Normal semicontinuity and the Dedekind completion of pointfree function rings (with J. Gutiérrez García and I. Mozo Carollo)
         Algebra Universalis 75 (2016) 301-330.
         Review (zbMATH)

  32. On an aspect of scatteredness in the pointfree setting (with Richard N. Ball and Aleš Pultr)
         Portugaliae Mathematica 73 (2016) 139-152.
         Review (MR, zbMATH)

  33. Presenting the frame of the unit circle (with J. Gutiérrez García and I. Mozo Carollo)
         Journal of Pure and Applied Algebra 220 (2016) 976–1001.
         Review (zbMATH)

  34. On permutable pairs of quasi-uniformities (with Maria João Ferreira and Mack Matlabyana)
         Topology and its Applications 196 (2015) 260-273.
         Review (MR, zbMATH)

  35. More on subfitness and fitness (with Aleš Pultr)
         Applied Categorical Structures 23 (2015) 323-335.
         Review (MR, zbMATH)

  36. Notes on the product of locales (with Aleš Pultr)
         Mathematica Slovaca 65 (2015) 247-264.
         Review (MR, zbMATH)

  37. On the Dedekind completion of function rings (with I. Mozo Carollo and J. Gutiérrez García)
         Forum Mathematicum 27 (2015) 2551-2585.
         Review (MR, zbMATH)

  38. Notes on point-free real functions and sublocales (with J. Gutiérrez García and Aleš Pultr)
         Categorical Methods in Algebra and Topology, Textos de Matemática, DMUC, Vol. 46, 2014, pp. 167-200.

  39. Monotone normality and stratifiability from a pointfree point of view (with J. Gutiérrez García and M. A. de Prada Vicente)
         Topology and its Applications 168 (2014) 46-65.
         Review (MR, zbMATH)

  40. (Sub)Fit biframes and non-symmetric nearness (with Aleš Pultr)
         Topology and its Applications 168 (2014) 66-81.
         Review (MR, zbMATH)

  41. On the parallel between normality and extremal disconnectedness (with J. Gutiérrez García)
         Journal of Pure and Applied Algebra 218 (2014) 784-803.
         Review (MR, zbMATH)

  42. Notes on exact meets and joins (with Richard N. Ball and Aleš Pultr)
         Applied Categorical Structures 22 (2014) 699-714.
         Review (zbMATH)

  43. Insertion and extension results for pointfree complete regularity (with J. Gutiérrez García)
         Bulletin of the Belgian Mathematical Society - Simon Stevin 20 (2013) 675-687.
         Review (MR, zbMATH)

  44. Entourages, covers and localic groups (with Aleš Pultr)
         Applied Categorical Structures 21 (2013) 49-66.
         Review (MR, zbMATH)

  45. On strong inclusions and asymmetric proximities in frames (with Aleš Pultr)
         Order 29 (2012) 513-531.
         Review (MR, zbMATH)

  46. Extended real functions in pointfree topology (with B. Banaschewski and J. Gutiérrez García)
         Journal of Pure and Applied Algebra 216 (2012) 905-922.
         Review (MR, zbMATH)

  47. Rings of real functions in pointfree topology (with J. Gutiérrez García)
         Topology and its Applications 158 (2011) 2264-2278.
         Review (MR, zbMATH)

  48. The semicontinuous quasi-uniformity of a frame, revisited (with M. J. Ferreira)
         Quaestiones Mathematicae 34 (2011) 175-186.
         Review (MR)

  49. On the uniformization of lattice-valued frames (with J. Gutiérrez García, I. Mardones-Pérez and M.A. de Prada Vicente)
         Fuzzy Sets and Systems 166 (2011) 90-100.

  50. Cover quasi-uniformities in frames (with Aleš Pultr)
         Topology and its Applications 158 (2011) 869–881.
         Review (zbMATH)

  51. Insertion of continuous real functions on spaces, bispaces, ordered spaces and point-free spaces - a common root (with M. J. Ferreira and J. Gutiérrez García)
         Applied Categorical Structures 19 (2011) 469-487.
         Review (MR, zbMATH)

  52. How to deal with the ring of (continuous) real-valued functions in terms of scales (with Javier Gutiérrez García)
         Applied Topology: Recent progress for Computer Science, Fuzzy Mathematics and Economics (Proceedings of WiAT'10, Gandia, 2010),
         Editorial Universitat Politècnica de València, ISBN 978-84-8363-565-0, 2010, pgs. 19-30. Pdf file

  53. An invitation to localic real functions (with Javier Gutiérrez García and Tomasz Kubiak)
         Applied Topology: Recent progress for Computer Science, Fuzzy Mathematics and Economics (Proceedings of WiAT'10, Gandia, 2010),
         Editorial Universitat Politècnica de València, ISBN 978-84-8363-565-0, 2010, pgs. 119-129. Pdf file

  54. Localic real functions: a general setting (with Javier Gutiérrez García and Tomasz Kubiak)
         Journal of Pure and Applied Algebra 213 (2009) 1064-1074.
         Review (MR)

  55. Completely normal frames and real-valued functions (with M. J. Ferreira and J. Gutiérrez García)
         Topology and its Applications 156 (2009) 2932–2941.
         Review (zbMATH)

  56. Lower and upper regularizations of frame semicontinuous real functions (with J. Gutiérrez García and T. Kubiak)
         Algebra Universalis 60 (2009) 169-184.
         Review (zbMATH)

  57. Pointfree forms of Dowker's and Michael's insertion theorems (with J. Gutiérrez García and T. Kubiak)
         Journal of Pure and Applied Algebra 213 (2009) 98-108.
         Review (zbMATH)

  58. Uniform-type structures on lattice-valued spaces and frames (with J. Gutiérrez García, I. Mardones-Pérez and M.A. de Prada Vicente)
         Fuzzy Sets and Systems 159 (2008) 2469– 2487.
         Review (zbMATH)

  59. Monotone insertion and monotone extension of frame homomorphisms (with J. Gutiérrez García and T. Kubiak)
         Journal of Pure and Applied Algebra 212 (2008) 955-968.

  60. Ideals in Heyting semilattices and open homomorphisms (with Aleš Pultr and Anna Tozzi)
         Quaestiones Mathematicae 30 (2007) 391–405.
         Review (zbMATH)

  61. On point-finiteness in pointfree topology (with Maria João Ferreira)
         Applied Categorical Stuctures 15 (2007) 185–198.
         Review (MR)

  62. On the algebraic representation of semicontinuity (with J. Gutiérrez García)
         Journal of Pure and Applied Algebra 210 (2007) 299-306.

  63. Sublocale sets and sublocale lattices (with Aleš Pultr)
         Arch. Math. (Brno) 42 (2006) 409-418.
         Review (zbMATH)

  64. A new look at localic interpolation theorems
         Topology and its Applications 153 (2006) 3203-3218.
         Review (MR)

  65. The semicontinuous quasi-uniformity of a frame (with Maria João Ferreira)
          Kyungpook Mathematical Journal 46 (2006) 189-200.
         Review (zbMATH)

  66. Functorial quasi-uniformities on frames (with Maria João Ferreira)
         Applied Categorical Structures 13 (2005) 281-303.
         Review (MR)

  67. The Galois approach to uniform structures (with Maria João Ferreira)
         Quaestiones Mathematicae 28 (2005) 355-373.
         Review (MR)

  68. The quantale of Galois connections
         Algebra Universalis 52 (2004) 527 - 540.
         Review (MR)

  69. A method of constructing compatible quasi-uniformities for an arbitrary frame (with Maria João Ferreira)
         Kyungpook Mathematical Journal 44 (2004) No. 3, 415-442.
         Review (MR)

  70. The gauge of a uniform frame
         Applied Categorical Structures 10 (2002) 593-602.
         Review (zbMATH)

  71. Frames with transitive structures (with W. Hunsaker),
         Applied Categorical Structures 10 (2002) 63-79.
         Review (MR, zbMATH)

  72. On complete congruence lattices of join-infinite distributive lattices
         Algebra Universalis 44 (2000) 325-332.
         Review (zbMATH)

  73. A note on total boundedness (with W. Hunsaker),
         Acta Mathematica Hungarica 88 (2000) 25-34.

  74.  Structured frames by Weil entourages,
         Applied Categorical Structures 8 (2000) 351-366.
         Review (zbMATH)

  75.  Two theorems of Efremovic in pointfree context,
         Journal of Pure and Applied Algebra 141 (1999) 289-298.

  76.  Priestley duality within frames,
         Proceedings of the Workshop on Dualities, Interpretability and Ordered Structures (CAUL, September 1997), University of Lisbon, 1999, pp. 21-33. Abstract, Postscript file

  77.  Frame quasi-uniformities by entourages,
         Festschrift (on the occasion of the 60th birthday of Guillaume Brümmer) incorporating Proceedings Symposium on Categorical Topology (University of Cape Town 1994),
         Department of Mathematics, University of Cape Town, 1999, pp. 161-175. Abstract

  78.  Weil nearness spaces,
         Portugaliae Mathematica 55 (1998) 233-254.
         Review (zbMATH)

  79.  On extended frames,
         Comment. Math. Univ. Carolinae 36 (1995) 537-549. Abstract

  80.  Weil uniformities for frames,
         Comment. Math. Univ. Carolinae 36 (1995) 357-370.
         Review (MR, zbMATH)

  81.  Join-continuous frames, Priestley's duality and biframes,
         Applied Categorical Structures 2 (1994) 297-313.
         Review (MR)

  82.  On two extensions of Dickson's torsion theory,
         Communications in Algebra 21 (1993) 2749-2769.


Dissertations
  1.  Vizinhanças da Diagonal no Sentido de Weil em Reticulados Locais
         Dissertação de Doutoramento, Universidade de Coimbra, 1995 (166 pgs). Resumo

         English version: Weil Entourages in Pointfree Topology
         Ph. D. Thesis, University of Coimbra, 1995 (161 pgs). Abstract

  2.  Teorias de Torção,
         Dissertação de Mestrado, Universidade de Coimbra, 1990 (100 pgs). Resumo

         English version: Torsion Theories
         M. Sc. Thesis, University of Coimbra, 1990 (99 pgs). Abstract

Books (authored)
  1.  Separation in point-free topology (with Aleš Pultr)
         Birkhäuser/Springer Cham, xxi + 281 pp. 2021 (ISBN: 978-3-030-53478-3).
         Front Matter.
         Review (MR).

  2.  Frames and locales: topology without points (with Aleš Pultr)
         Springer Basel, Series Frontiers in Mathematics, Vol. 28, xx + 400 pp., 2012 (ISBN: 978-3-0348-0153-9).
         Contents, Preface, ERRATA.
         Review (zbMATH, MR).

  3.  Locales treated mostly in a covariant way (with Aleš Pultr)
         Textos de Matemática, DMUC, Vol. 41, xi + 104 pp., 2008 (ISBN 978-972-8564-45-2).
         PDF file, ERRATA.
         Review (zbMATH, MR).

  4.  Olimpíadas de Matemática - Cat. B (with Paulo Oliveira)
         Volume 2, Texto Editores, Setembro de 2007, ISBN 978-972-47-3582-5.

  5.  Olimpíadas de Matemática - Cat. A (with Paulo Oliveira)
         Volume 2, Texto Editores, Setembro de 2007, ISBN 978-972-47-3581-8.

  6.  Olimpíadas de Matemática - Cat. B (with Paulo Oliveira)
         Volume 1, Texto Editores, Novembro de 2006, ISBN 978-972-47-3255-8.

  7.  Olimpíadas de Matemática - Cat. A (with Paulo Oliveira)
         Volume 1, Texto Editores, Novembro de 2006, ISBN 978-972-47-3254-1.


Books (chapters)
  1.  Notes on Point-Free Topology (with Aleš Pultr)
         in: New Perspectives in Algebra, Topology and Categories (ed. by M.M. Clementino, A. Facchini, M. Gran),
         Coimbra Mathematical Texts, vol. 1, Springer, Cham, 2022, pp. 173-223.
         Review (zbMATH)

  2.  Das formas às fórmulas: estrutura e geometria das conchas marinhas
         in: Matemática do Planeta Terra
         IST Press, Lisboa, 2013, pp. 323-358.

  3.  Locales (with Aleš Pultr and Anna Tozzi)
         in: Categorical Foundations - Special Topics in Order, Topology, Algebra and Sheaf Theory
         Encyclopedia of Mathematics and its Applications, Vol. 97, Cambridge University Press, 2004, pp. 49-101.
         ERRATA, Review (zbMATH, MR, EMS).


Books (edited)
  1.  Categorical Methods in Algebra and Topology, a volume in honour of Manuela Sobral
         M. M. Clementino, G. Janelidze, J. Picado, L. Sousa, W. Tholen (Editors)
         Textos de Matemática, DMUC, Vol. 46, 292 pp., 2014.
         Table of Contents.

  2.  School on Category Theory and Applications
         M. M. Clementino, J. Picado, M. Sobral, L. Sousa (Editors)
         Textos de Matemática, DMUC, Vol. 21, iii + 159 pp., 1999.
         Contents, Review (MR).


Journals
  1.  Topology and its Applications 273 (2020) - Special volume dedicated to Aleš Pultr
         (Bernhard Banaschewski, Maria Manuel Clementino, J. Picado, editors)
         Foreword.

  2.  Topology and its Applications 158 (2011) - Special volume dedicated to Eraldo Giuli
         (Maria Manuel Clementino, J. Picado, Walter Tholen, editors)
         Foreword.

  3.  CIM Bulletin
         (António Cateano, J. Picado, editors, 2004-2008).


Course Notes
  1. Álgebra Comutativa: textos de apoio,
          Notas de curso, Universidade de Coimbra, 2013.

  2. Anéis (revisitados): divisibilidade e factorização,
          Notas de curso, Universidade de Coimbra, 2011.

  3. Sobre semicontinuidade de funções reais: uma descrição algébrica,
          Lição Síntese, Universidade de Coimbra, 2008.
          English translation: On semicontinuity of real functions --- an algebraic description, 2008.

  4. Corpos e Equações Algébricas
          Relatório de unidade curricular, Universidade de Coimbra, 2008.

  5. Corpos e Equações Algébricas
          Notas de curso, Universidade de Coimbra, 2008
          (Primeira versão: Aulas de Álgebra II, 2005).

  6. Estruturas Discretas para a Engenharia Informática
          Notas de curso, Universidade de Coimbra, 2007 (Última versão: Agosto de 2014).

  7.   Apontamentos de Geometria Diferencial
          Notas de curso, Universidade de Coimbra (última versão: 2006).

  8.   Matemática Discreta,
          Relatório de disciplina, Universidade de Coimbra, 2003.

  9.   Tópicos de Teoria Combinatória
          Notas de curso, Universidade de Coimbra, 2002.

  10.   Matemática Finita
          Relatório de disciplina, Universidade de Coimbra, 2000.

  11.   Textos de apoio de Álgebra (com Manuela Sobral)
          Notas de curso, Universidade de Coimbra, 2000.

  12.   Topologia sem pontos
          Curso intensivo, Escola de Outono do CAUL, Lisboa, 1998.

  13.   Apontamentos de Álgebra
          Notas de curso, Universidade de Coimbra, 1998.

  14.   Tópicos de Matemática Finita
          Notas de curso, Universidade de Coimbra, 1997.

  15.   Matemática Discreta
          Minicurso, Actas do IX Encontro Regional da Sociedade Portuguesa de Matemática (Tomar, 1986) 153-194. Resumo


Other
  1. Em busca da unidade: conexões de Galois e inversões de Möbius-Rota (with Pedro M. Silva),
          Boletim da Sociedade Portuguesa de Matemática 76 (2018) 57-88.

  2. Truques e magia com códigos algébricos (with Estefani Moraes Moreira),
          Gazeta de Matemática 175 (2015) 20-29.

  3. Análise de um jogo solitário com a ajuda do corpo GF(4) (with Paula Mendes Martins),
          Boletim da Sociedade Portuguesa de Matemática 69 (2013) 51-58.

  4. Existe um Sudoku com 16 pistas? (with Paula Mendes Martins),
          Boletim da Sociedade Portuguesa de Matemática 66 (2012) 57-63.

  5. Preface to "Matemática & Comboios" by Helder Pinto,
          Sociedade Portuguesa de Matemática, Leituras em Matemática, vol. 7, 2010.

  6. Seashells: the plainness and beauty of their mathematical description,
          Loci (Vol. 1, March 2009), DOI: 10.4169/loci003294,
          Journal of the MAA Mathematical Sciences Digital Library.

  7. An interview with F. William Lawvere - Part Two (with Maria Manuel Clementino),
          CIM Bulletin 24 (2008) 21-28.

  8. An interview with F. William Lawvere - Part One (with Maria Manuel Clementino),
          CIM Bulletin 23 (2007) 23-27.

  9. An interview with Eduardo L. Ortiz,
          CIM Bulletin 22 (2007) 20-23.

  10. A descrição matemática das conchas e do seu crescimento (with Helder Pinto),
          Página do Atractor - Matemática Interactiva, www.atractor.pt/mat/conchas, 2007.

  11. A beleza matemática das conchas marinhas,
          Gazeta de Matemática 152 (2007) 10-15. PDF file

  12. Matemática sem palavras (with Helder Pinto),
          Página do Atractor - Matemática Interactiva, www.atractor.pt/mat/sem_palavras, 2006.

  13. An interview with Marcelo Viana (with Maria Manuel Clementino),
          CIM Bulletin 20 (2006) 25-30.

  14. A curvatura e a torção: como distinguir a forma de uma curva (with Helder Pinto),
          Página do Atractor - Matemática Interactiva, www.atractor.pt/mat/curvtor, 2006.

  15. A álgebra das tranças (with Domingos Lopes),
          Boletim da Sociedade Portuguesa de Matemática 54 (2006) 29-69. PDF file

  16. Conchas marinhas: a simplicidade e beleza da sua descrição matemática,
          www.mat.uc.pt/~picado/conchas (Abril 2006)

  17. Sistemas de Identificação com Algarismos de Controlo (with Helder Pinto),
          Página do Atractor - Matemática Interactiva, www.atractor.pt/mat/alg_controlo, 2006.

  18. An interview with Alexei Sossinsky,
          CIM Bulletin 19 (2005) 24-29.

  19.   Interview with Jean Pierre Bourguignon (with F. J. Craveiro de Carvalho),
          Intern. Math. Nachrichten 186 (2001) 25-34.

  20.   A álgebra dos sistemas de identificação: da aritmética modular aos grupos diedrais,
          Boletim da Sociedade Portuguesa de Matemática 44 (2001) 39-73. Resumo PDF file

  21.   A matemática dos Bilhetes de Identidade,
          Millenium 19 (2000) 279-299.

  22.   Vizinhanças da Diagonal no Sentido de Weil em Reticulados Locais: principais resultados, consequências e aplicações,
          Relatório, Universidade de Coimbra, 1997.

  23.   Mathematical competitions in Portugal,
          Mathematics Competitions 5 (1992) 86-91. Abstract

  24.   Olhar retrospectivo sobre as Olimpíadas Nacionais de Matemática 1991,
          Boletim da Sociedade Portuguesa de Matemática 21 (1991) 45-67.

  25.   Olimpíadas Internacionais de Matemática,
          Jornal de Mathematica Elementar 109 (1991) 8-12.

  26.   A Matemática e o real: um exemplo (a propósito de um problema olímpico),
          Jornal de Mathematica Elementar 108 (1991) 8-10.

  27.   XXX Olimpíadas Internacionais de Matemática, Relato da primeira participação portuguesa,
          Boletim da Sociedade Portuguesa de Matemática 14 (1989) 38-45.