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20N99 None of the above, but in this section (37 articles)

• Donnelly, John: The group ring $\mathbb{K}F$ of Richard Thompson’s Group $F$ has no minimal non-zero ideals. (English). Archivum Mathematicum, vol. 55 (2019), issue 1, pp. 23-30
• Neggers, Joseph; Kim, Hee Sik: On $\beta$-algebras. (English). Mathematica Slovaca, vol. 52 (2002), issue 5, pp. 517-530
• Parmenter, M. M.: A remark on $k$-systems in groups. (English). Czechoslovak Mathematical Journal, vol. 49 (1999), issue 2, pp. 347-349
• Vougiouklis, Thomas: On rings with zero divisors. Strong $V$-groups. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 31 (1990), issue 3, pp. 431-433
• Ježek, Jaroslav; Kepka, Tomáš: Varieties of groupoids determined by short linear identities. (English). Czechoslovak Mathematical Journal, vol. 39 (1989), issue 4, pp. 644-658
• Konguetsof, L.; Vougiouklis, Th.: Constructions d'hyperanneaux à partir d'anneaux. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 28 (1987), issue 1, pp. 9-13
• Konguetsof, L.; Vougiouklis, Th.; Kessoglides, M.; Spartalis, St.: On cyclic hypergroups with period. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 28 (1987), issue 1, pp. 3-7
• Vougiouklis, Th.; Konguetsof, L.: $P$-hypergoupes. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 28 (1987), issue 1, pp. 15-20
• Ježek, Jaroslav: Equational theories of some almost unary groupoids. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 27 (1986), issue 3, pp. 421-433
• Kepka, T.; Niemenmaa, M.: On splitting $k$-systems. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 27 (1986), issue 2, pp. 3-10
• Freni, D.: Sul la theorie de la dimension dans les hypergroupes. (French). Acta Universitatis Carolinae. Mathematica et Physica, vol. 27 (1986), issue 2, pp. 67,80
• Tallini, Guiseppe: Geometric hyperquasigroups and line spaces. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 25 (1984), issue 1, pp. 69-73
• Kepka, Tomáš; Kratochvíl, Jan: Graphs and associative triples in quasitrivial groupoids. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 25 (1984), issue 4, pp. 679-687
• Comer, Stephen D.: Constructions of color schemes. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 24 (1983), issue 2, pp. 39-48
• Kepka, Tomáš: Distributive groupoids and preradicals. I. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 24 (1983), issue 1, pp. 183-197
• Kepka, Tomáš: Distributive groupoids and preradicals. II. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 24 (1983), issue 2, pp. 199-209
• Corsini, P.: Feebly canonical and 1-hypergroups. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 24 (1983), issue 2, pp. 49-56
• Ježek, Jaroslav; Kepka, Tomáš: Notes on distributive groupoids. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 24 (1983), issue 2, pp. 237-249
• Kepka, T.: One-element extensions of distributive groupoids. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 24 (1983), issue 2, pp. 73-77
• Ježek, Jaroslav: The number of minimal varieties of idempotent groupoids. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 23 (1982), issue 1, pp. 199-205
• Vougiouklis, T.: Cyclicity in a special class of hypergroups. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 22 (1981), issue 1, pp. 3-6
• Ježek, Jaroslav; Kepka, Tomáš: Free entropic groupoids. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 22 (1981), issue 2, pp. 223-233
• Kepka, Tomáš: A note on subdirectly irreducible groupoids. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 22 (1981), issue 1, pp. 25-28
• Fauknerová, Jarmila: A note on the finite extensivity property. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 22 (1981), issue 1, pp. 137-143
• Kepka, Tomáš: Notes on left distributive groupoids. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 22 (1981), issue 2, pp. 23-37
• Kepka, Tomáš: On a class of groupoids. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 22 (1981), issue 1, pp. 29-49
• Kepka, Tomáš: On a class of subdirectly irreducible groupoids. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 22 (1981), issue 1, pp. 17-24
• Vougiouklis, T.: The set of hypergroups with operators which are constructed from a set with two elements. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 22 (1981), issue 1, pp. 7-10
• Kepka, Tomáš: A note on associative triples of elements in cancellation groupoids. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 21 (1980), issue 3, pp. 479-487
• Byrd, Richard D.; Lloyd, Justin T.; Mena, Roberto A.; Teller, J. Roger: The lattice of solid $\sigma$-subgroups of a retractable group. (English). Czechoslovak Mathematical Journal, vol. 28 (1978), issue 2, pp. 189-199
• Močkoř, Jiří: A realization of $d$-groups. (English). Czechoslovak Mathematical Journal, vol. 27 (1977), issue 2, pp. 296-312
• Kepka, Tomáš: $\Lambda$, $R$-transitive groupoids. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 16 (1975), issue 2, pp. 71-77
• Borůvka, Otakar Foundations of the theory of groupoids and groups (English). Hochschulbücher für Mathematik. Band 46. VEB Deutscher Verlag der Wissenschaften, Berlin, 1974, 215 s.
• Křivka, Pavel: On representations of monoids as monoids of polynomials. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 13 (1972), issue 1, pp. 121-136
• Schein, B. M.: Involuted Restrictive Bisemigroups of Binary Relations. (English). Matematický časopis, vol. 19 (1969), issue 4, pp. 307-315
• Sedláček, Ladislav: Zum Problem des Isomorphismus der direkten Produkte von Gruppoiden. (German) [On a problem of isomorphism of direct products of groupoids]. Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica-Physica-Chemica, vol. 9 (1968), issue 1, pp. 111-134
• Sedláček, Ladislav: Grupoidy a grupy s operátory. (Czech) [Groupoids and groups with operators]. Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica-Physica-Chemica, vol. 2 (1961), issue 1, pp. 33-66