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[11] J. Reiterman, M. Sobral and W. Tholen, Composites of e↵ective descent maps, Cahiers de Topologie et G´eom´etrie Di↵´erentielle Cat´egoriques 34 (1993) 193–207.
[12] M. Sobral, Descent for Discrete (Co)fibrations, Applied Categorical Structures 12 (2004) 527–535.
[13] M. Sobral, Another approach to topological descent theory, Applied Categorical Struc- tures 9 (2001) 505–516.
[14] M. Sobral, Some aspects of topological descent, Applied Categorical Structures 4 (1996) 97–106.
[15] M. Sobral and W. Tholen, E↵ective descent morphisms and e↵ective equivalence rela- tions, Canadian Mathematical Society Conference Proceedings (AMS, Providence 1992) 421–431.
(N. Martins-Ferreira) Escola Superior de Tecnologia e Gesta˜o, Centro para o Desenvolvimento Ra´pido e Sustentado do Produto, Instituto Polite´cnico de Leiria, 2411 - 901 Leiria, Portugal
E-mail address: martins.ferreira@ipleiria.pt
