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[18] G. Janelidze, W. Tholen, Facets of descent I, Appl. Cat. Structures 2 (1994), no. 3, 245–281.
[19] P.T. Johnstone and M.C. Pedicchio, Remarks on continuous Mal’cev algebras, Rend. Istit. Mat. Univ. Trieste 25 (1993), no. 1-2, 277–297.
[20] V. Rossi, Admissible Galois Structures and Coverings in Regular Mal’cev Categories, Appl. Categ. Structures 14 (2006), no. 4, 291–311.
[21] W. Rump, Almost abelian categories, Cahiers Topologie G´eom. Di↵´erentielle Cat´egor. 42, (2001), no. 3, 163–225.
[22] J.D.H. Smith, Mal’cev Varieties, Lect. Notes Math. 554, Springer Verlag (1976).
(M. Gran) Institut de Recherche en Mathe´matique et Physique, Universite´ Catholique de Louvain, Chemin du Cyclotron 2, 1348 Louvain-la-Neuve, Bel- gium
E-mail address: marino.gran@uclouvain.be
(D. Rodelo) CMUC, Universidade de Coimbra, 3001–501 Coimbra, Portugal, and Departamento de Matema´tica, Faculdade de Cieˆncias e Tecnologia, Universi- dade do Algarve, Campus de Gambelas, 8005–139 Faro, Portugal
E-mail address: drodelo@ualg.pt