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08.10 Concrete categories, structures (3 articles)

• Banaschewski, B.: Projective covers in categories of topological spaces and topological algebras. (English). In: Franklin, S. P., Frolík, Z. and Koutník, V. (eds.): General Topology and Its Relations to Modern Analysis and Algebra. Proceedings of the Kanpur topological conference, 1968. Academia Publishing House of the Czechoslovak Academy of Sciences, Praha, 1971. pp. [63]-91
• Hasse, Maria; Michler, Lothar: Einige Bemerkungen über freie Kategorien und freie Gruppoide. (German) [Some remarks on free categories and free groupoids]. Czechoslovak Mathematical Journal, vol. 16 (1966), issue 3, pp. 424-445
• Trnková, Věra: К теории категорий. (Russian) [On the theory of categories]. Commentationes Mathematicae Universitatis Carolinae, vol. 3 (1962), issue 4, pp. 9-35