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18Dxx Categories with structure (2 articles)

• Trnková, Věra: Strong embedding of category of all groupoids into category of semigroups. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 9 (1968), issue 2, pp. 251-256
• Drbohlav, Karel: A categorical generalization of a theorem of G. Birkhoff on primitive classes of universal algebras. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 6 (1965), issue 1, pp. 21-41