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18-00 General reference works (handbooks, dictionaries, bibliographies, etc.) (3 articles)

• Pultr, Aleš; Sichler, Jiří: Primitive classes of algebras with two unary idempotent operations, containing all algebraic categories as full subcategories. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 10 (1969), issue 3, pp. 425-445
• Sichler, Jiří: Concerning minimal primitive classes of algebras containing any category of algebras as a full subcategory. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 9 (1968), issue 4, pp. 627-635
• Mozzochi, Charles J.: A partial generalization of a theorem of Hursch. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 9 (1968), issue 1, pp. 157-159