[1] Note to the problem of intersecting broken lines (Czech). Čas. pěst. mat. 83 (1958), 236–240.

[2] On a certain group of endomorphisms on a simply ordered set I (Czech). Čas. pěst. mat. 84 (1959), 177–182.

[3] On a certain group of endomorphisms on a simply ordered set II (Czech). Čas. pěst. mat. 85 (1960), 263–273.

[4] Bemerkung zu einer Halbgruppe der Endomorphismen auf einer einfach geordneten Menge. Čas. pěst. mat. 85 (1960), 410–417. MR 0130312 | Zbl 0122.02601

[5] On singular systems of integer-differential equations with constant coefficients and their realization by linear electric circerits (Czech). Práce ČVUT, řada III elektrotechnická, č. 5 (1965), 63–72.

[6] On characters of chains (Czech). Čas. pěst. mat. 91 (1966), 1–3 (Spoluautor: O. Kowalski.). MR 0190043

[7] On characters of semigroups whose idempotents form a chain (Czech). Čas. pěst. mat. 91 (1966), 4–7. MR 0197602

[8] Note to the Richards transformation (Russian). Acta Polytechnica — Práce ČVUT, III 1 (1967), 27–34.

[9] The diameter of the graph of a semigroup (Czech). Čas. pěst. mat. 92 (1967), 206–211. MR 0223275

[10] On periodic and recurrent compact groupoids. Čas. pěst. mat. 93 (1968), 262–272. MR 0252550

[11] A contribution to the foundations of network theory using the distribution theory. Czechoslov. Math. J. 19(94) (1969), 697–710. MR 0253047

[12] On a certain relation for closure operations on a semigroup. Czechoslov. Math. J. 20(95) (1970), 220–231. MR 0260905

[13] Note on a certain relation for closure operations on a compact semigroup. Czechoslov. Math. J. 20(95) (1970), 337–339. MR 0260906

[14] Contribution to the foundations of network theory using the distribution theory, II. Czechoslov. Math. J. 21(96) (1971), 35–45. MR 0276763 | Zbl 0217.16703

[15] A certain equivalence on a semigroup. Czechoslov. Math. J. 21(96) (1971), 109–117. MR 0283110 | Zbl 0217.36404

[16] Right prime ideals and maximal right ideals in semigroups. Mat. Čas. Slovensk. Akad. Vied 21 (1971), 87–90. MR 0302801 | Zbl 0219.20043

[17] A note on classes of regularity in semigroups. Mat. Čas. Slovensk. Akad. Vied 21 (1971), 312–317. MR 0301122 | Zbl 0235.20057

[18] Green’s relations on a compact semigroup. Czechoslov. Math. J. 22(97) (1972), 69–77. MR 0299715 | Zbl 0235.22006

[19] Archimedean equivalence on ordered semigroups. Czechoslov. Math. J. 22(97) (1972), 210–219. MR 0294200 | Zbl 0251.06025

[20] A note on an ideal quasi-order in semigroups. Publ. Math. Debrecen 18 (1972), 177–182. MR 0308302

[21] A characterization of semilattices of left or right groups. Czechoslov. Math. J. 22(97) (1972), 522–524. MR 0313431 | Zbl 0247.20073

[22] A note on radicals of semigroups. Mat. Čas. Slovensk. Akad. Vied 23 (1973), 14–16. MR 0327954 | Zbl 0253.20084

[23] A relation for closure operations on a semigroup. Mat. Čas. Slovensk. Akad. Vied 23 (1973), 249–256. MR 0364509 | Zbl 0265.20053

[24] On weakly commutative semigroups. Czechoslov. Math. J. 25(100) (1975), 20–23. MR 0387460 | Zbl 0307.20039

[25] A note on Hilbert formalism of quantum mechanics. Rep. on Math. Phys. 8 (1975), 75–77. DOI 10.1016/0034-4877(75)90019-1 | MR 0411455

[26] $T$-prime subsets in semigroups. Mat. Čas. Slovensk. Akad. Vied. 25 (1975), 223–229. MR 0399320

[27] On semigroups having regular globals. Colloquia Math. Soc. János Bolyai 20. Algebraic theory of semigroups, Szeged, 1976, pp. 453–461. MR 0541132

[28] The chain of right ideals in rings and semigroups. Ann. Univ. Sci. Budapest, Sectio Math. 20 (1977), 21, 22. MR 0476798 | Zbl 0372.16012

[29] On tolerances on periodic semigroups. Czechoslov. Math. J. 28(103) (1978), 647–649. MR 0498924 | Zbl 0399.20053

[30] On the intersection graph of a commutative distributive groupoid. Math. Slovaca 29 (1979), 57–62. MR 0561777 | Zbl 0408.20040

[31] The intersection graph of a simply ordered semigroup. Semigroup Forum 18 (1979), 229–233. DOI 10.1007/BF02574187 | MR 0549003 | Zbl 0419.06008

[32] The intersection graph of an ordered commutative semigroup. Semigroup Forum 19 (1980), 213–218. DOI 10.1007/BF02572517 | MR 0564230 | Zbl 0429.06003

[33] Relative compact elements in lattices. Colloquia Math. Soc. János Bolayai 33, Szeged (1980), 667–674. MR 0724289

[34] On representations of tolerance ordered commutative semigroups. Czechoslov. Math. J. 31(106) (1981), 153–158. MR 0604121 | Zbl 0469.20035

[35] Uniform semigroups whose proper quasi-ideals are power joined. Semigroup Forum 22 (1981), 331–337. DOI 10.1007/BF02572812 | MR 0619189 | Zbl 0465.20058

[36] On compositional and convolutional discrete systems. Kybernetika 17 (1981), 277–286. MR 0643915 | Zbl 0469.93066

[37] Note on a completely symmetrical semigroup. Notes on Semigroups VII, 1981–4, 1–4, Dept. of Math. Karl Marx Univ. of Economics, Budapest. Zbl 0478.20042

[38] Atomicity of tolerance lattices of commutative semigroups. Czechoslov. Math. J. 33(108) (1983), 485–498. MR 0718931 | Zbl 0535.20041

[39] Modularity and distributivity of tolerance lattices of commutative inverse semigroups. Czechoslov. Math. J. 35(110) (1985), 146–157. MR 0779342 | Zbl 0581.20058

[40] Modularity and distributivity of tolerance lattices of commutative separative semigroups. Czechoslov. Math. J. 35(110) (1985), 333–337. MR 0787135 | Zbl 0573.20062

[41] Note on quasi Hamiltonian semigroups. Čas. pěst. mat. 110 (1985), 356–358. MR 0820325 | Zbl 0588.20036

[42] Semigroups whose proper one-sided ideals are $t$-archimedean. Mat. Věstnik 37 (1985), 315–321. Zbl 0601.20055

[43] Tolerance distributive and tolerance modular varieties of commutative semigroups. Czechoslov. Math. J. 36(11) (1986), 485–488. MR 0847775 | Zbl 0614.20043

[44] On a certain class of BCK-algebras with condition (S). Math. Japonica 31 (1986), no. 5, 775–782. MR 0872798 | Zbl 0616.03044

[45] Tolerance distributive and tolerance boolean varieties of semigroups. Czechoslov. Math. J. 36(111) (1986), 617–622. MR 0863191 | Zbl 0612.20033

[46] Note on band decompositions of weakly exponential semigroups. Ann. Univ. Sci. Budapest, Sectio Math 29 (1986), 139–141. MR 0893495 | Zbl 0622.20054

[47] Note on nilpotency in semigroups. Math. Slovaca 37 (1987), 205–208. MR 0899437 | Zbl 0632.20038

[48] Note on the congruence lattice of a commutative separative semigroup. Čas. pěst. mat. 113 (1988), 74–79. MR 0930808 | Zbl 0639.20043

[49] Commutative semigroups whose lattice of tolerances is boolean. Czechoslov. Math. J. 38(113) (1988), 226–230. MR 0946290 | Zbl 0657.20052

[50] Principal tolerance trivial commutative semigroups. Acta Sci. Math. 52 (1988), 29–33. MR 0957785 | Zbl 0651.08002

[51] Direct decomposability of tolerances and congruences on semigroups. Czechoslov. Math. J. 38(113) (1988), 701–704. MR 0962913 | Zbl 0668.08002

[52] Algebras with tolerance extension property in $O$. Czechoslov. Math. J. 39(114) (1989), 142–146, (coauthor: I. Chajda). MR 0983491

[53] On $\alpha $-ideals and generalized $\alpha $-ideals in semigroups. Czechoslov. Math. J. 39(114) (1989), 522–527, (coauthor: M. M. Miccoli). MR 1006318 | Zbl 0684.20053

[54] Tolerance modular varieties of semigroups. Czechoslov. Math. J. 40(115) (1990), 441–452. MR 1065023 | Zbl 0731.20039

[55] On varieties of regular $\ast $-semigroups. Czechoslov. Math. J. 42(116) (1991), 110–119. MR 1087630

[56] On varieties of regular $\ast $-semigroups, II. Czechoslov. Math. J. 41(116) (1991), 512–517. MR 1117804

[57] On permutability in semigroup varieties. Mathematica Bohemica 116 (1991), 396–400. MR 1146398 | Zbl 0746.20034