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20M99 None of the above, but in this section (36 articles)

• Donnelly, John: A cancellative amenable ascending union of nonamenable semigroups. (English). Czechoslovak Mathematical Journal, vol. 61 (2011), issue 3, pp. 687-690
• Chen, Wei; Zhao, Xianzhong: The structure of idempotent residuated chains. (English). Czechoslovak Mathematical Journal, vol. 59 (2009), issue 2, pp. 453-479
• Demlová, Marie; Koubek, Václav: On universality of semigroup varieties. (English). Archivum Mathematicum, vol. 42 (2006), issue 4, pp. 357-386
• Ježek, Jaroslav; Kepka, Tomáš: Selfdistributive groupoids. Part D1: Left distributive semigroups. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 47 (2006), issue 1, pp. 15-56
• Demlová, M.; Koubek, V.: Weak alg-universality and $Q$-universality of semigroup quasivarieties. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 46 (2005), issue 2, pp. 257-279
• Kelarev, A. V.; Quinn, S. J.: A combinatorial property and power graphs of semigroups. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 45 (2004), issue 1, pp. 1-7
• Ibrahim, Mohammed Ali Faya: On the embedding of ordered semigroups into ordered group. (English). Czechoslovak Mathematical Journal, vol. 54 (2004), issue 2, pp. 303-313
• Czédli, Gábor; Horváth, Eszter K.; Klukovits, Lajos: Associativity in monoids and categories. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 40 (2001), issue 1, pp. 47-53
• Rachůnek, Jiří: DRl-semigroups and $MV$-algebras. (English). Czechoslovak Mathematical Journal, vol. 48 (1998), issue 2, pp. 365-372
• Novák, Vítězslav: Ternary structures and partial semigroups. (English). Czechoslovak Mathematical Journal, vol. 46 (1996), issue 1, pp. 111-120
• Abrhan, Imrich: On minimal ideals in semigroups with respect to their subsets. II. (English). Mathematica Slovaca, vol. 44 (1994), issue 4, pp. 463-478
• Merlier, Thérèse: On lattice ordered periodic semigroups. (English). Czechoslovak Mathematical Journal, vol. 43 (1993), issue 1, pp. 95-106
• Mlček, Josef: Valuations of lines. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 33 (1992), issue 4, pp. 667-679
• Koubek, Václav; Rödl, Vojtěch: Note on the number of monoids of order $n$. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 26 (1985), issue 2, pp. 309-314
• de Bodt, Ann; Satyanarayana, M.: On semigroups admitting ring structure III. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 24 (1983), issue 2, pp. 17-22
• Ježek, Jaroslav; Kepka, Tomáš: Semigroup representations of medial groupoids. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 22 (1981), issue 3, pp. 513-524
• Lee, Sin Min: On a simple one-element extension of left zero semigroups. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 21 (1980), issue 2, pp. 313-318
• Luedeman, John K.: Closure operations and semigroups of quotients. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 20 (1979), issue 3, pp. 529-537
• Pondělíček, Bedřich: On tolerances on periodic semigroups. (English). Czechoslovak Mathematical Journal, vol. 28 (1978), issue 4, pp. 647-649
• Kastl, Jan: Die $K$-abgeschlossenen Teilmengen der Halbgruppen. (German) [The $K$-closed subsets of semigroups]. Commentationes Mathematicae Universitatis Carolinae, vol. 17 (1976), issue 1, pp. 135-146
• Kastl, Jan; Tichý, Tomáš: Die Darstellung von partiellen $K$-stelligen Operationen. (German) [The representation of partial $K$-ary operations]. Commentationes Mathematicae Universitatis Carolinae, vol. 17 (1976), issue 1, pp. 167-178
• Skula, Ladislav: On extensions of partial $x$-operators. (English). Czechoslovak Mathematical Journal, vol. 26 (1976), issue 3, pp. 477-505
• Butler, Kim Ki-Hang; Schwarz, Štefan: The semigroup of circulant Boolean matrices. (English). Czechoslovak Mathematical Journal, vol. 26 (1976), issue 4, pp. 632-635
• Kuczkowski, Joseph E.: On the Embedding of Semigroups into Nilpotent Groups. (English). Matematický časopis, vol. 25 (1975), issue 3, pp. 245-247
• Satko, Ladislav: Тензорное произведение полугрупп и максимальные полуструктурные образы. (Russian) [Tensor Products of Semigroups and Maximal SemilatticeImages]. Matematický časopis, vol. 24 (1974), issue 3, pp. 239-246
• Krutský, František: Über eine algebraische Ausnutzung der messbaren Transformationen. (German) [On an algebraic application of measurable transforms]. Sborník prací Přírodovědecké fakulty University Palackého v Olomouci. Matematika, vol. 13 (1973), issue 1, pp. 5-13
• Tichý, Tomáš; Vinárek, Jiří: On the algebraic characterization of systems of $1-1$ partial mappings. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 13 (1972), issue 4, pp. 711-720
• Kuczkowski, Joseph E.: On the Embedding of Semigroups into 2-Engel Groups. (English). Matematický časopis, vol. 22 (1972), issue 4, pp. 282-285
• Krutský, František: Zobecnění teorému symetrizace. (Czech) [Generalization of symmetrization theorem]. Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica-Physica-Chemica, vol. 11 (1971), issue 1, pp. 51-59
• Segal, J.: On the shape classification of manifold-like continua. (English). In: Novák, J. (ed.): General Topology and its Relations to Modern Analysis and Algebra. Proceedings of the Third Prague Topological Symposium, 1971. Academia Publishing House of the Czechoslovak Academy of Sciences, Praha, 1972. pp. 389-391
• Hrmová, Renáta: Partial groupoids with some associativity conditions. (English). Matematický časopis, vol. 21 (1971), issue 4, pp. 285-311
• Baranskij, V. A.; Trahtman, A. N.: О подполугрупповых графах. (Russian) [On Subsemigroup Graphs]. Matematický časopis, vol. 20 (1970), issue 2, pp. 135-140
• Salii, V. N.: Полугруппы случайных отношений. (Russian) [Semigroups of Random Relations]. Matematický časopis, vol. 20 (1970), issue 2, pp. 122-134
• Pondělíček, Bedřich: Průměr grafu pologrupy. (Czech) [The diameter of graph of semigroup]. Časopis pro pěstování matematiky, vol. 92 (1967), issue 2, pp. 206-211
• Bosák, Juraj: B-pologrupy. (Slovak) [B-Semigroups]. Matematicko-fyzikálny časopis, vol. 11 (1961), issue 1, pp. 32-44
• Parízek, Bohumír: O rozklade pologrupy zvyškov (mod $m$) na direktný súčin. (Slovak) [On the Decomposition of the Semigroup of Residue Classes (mod $m$) into a Direct Product]. Matematicko-fyzikálny časopis, vol. 10 (1960), issue 1, pp. 18-29