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20Nxx Other generalizations of groups (3 articles)

• Havel, Václav: Nets and groupoids. II. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 9 (1968), issue 1, pp. 87-93
• Havel, Václav: Nets and groupoids. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 8 (1967), issue 3, pp. 435-451
• Havel, Václav: Ternary halfgroupoids and coordinatization (Preliminary communication). (English). Commentationes Mathematicae Universitatis Carolinae, vol. 8 (1967), issue 4, pp. 569-580