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06.70 Ordered semigroups, other generalizations of groups (4 articles)

• Zelinka, Bohdan: O jednom typu multiplikativních svazů. (Czech) [On a Type of Multiplicative Lattices]. Matematický časopis, vol. 18 (1968), issue 2, pp. 90-98
• Krishnan, V. S.: Semiuniform spaces, and seminorms, semimetrics, semiecarts in apo-semigroups. (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. [163]-171
• Kowalski, Oldřich: Über $U$-Homomorphismen und Homomorphismen der ganzen $l$-Halbgruppen auf $l$-Halbgruppen mit der guten Arithmetik. (German) [On $U$-homomorphisms and homomorphisms of the whole $l$-semigroups on $l$-semigroups with the good arithmetics]. Czechoslovak Mathematical Journal, vol. 18 (1968), issue 1, pp. 1-15
• Jakubík, Ján: Лексикографические произведения частично упорядоченных группоидов. (Russian) [Lexicographic products of partially ordered groupoids]. Czechoslovak Mathematical Journal, vol. 14 (1964), issue 2, pp. 281-305