Geodesic
$r$-systems of unary algebras. II: Maximal and minimal subalgebras of the direct products of unary algebras
Mathematica slovaca, Tome 44 (1994) no. 1, pp. 69-83
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     title = {$r$-systems of unary algebras. {II:} {Maximal} and minimal subalgebras of the direct products of unary algebras},
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Abrhan, Imrich; Satko, Ladislav. $r$-systems of unary algebras. II: Maximal and minimal subalgebras of the direct products of unary algebras. Mathematica slovaca, Tome 44 (1994) no. 1, pp. 69-83. http://geodesic.mathdoc.fr/item/MASLO_1994_44_1_a6/

[1] ABRHAN I., SATKO L.: r-systems of unary algebras I. Math. Slovaca 44 (1994), 69-83. | MR | Zbl

[2] ABRHAN I.: On maximal subalgebras of unary algebras. (Russian), Mat. Cas. 24 (1974), 113-128. | MR

[3] ABRHAN I.: On J-Subalgebras of Unary Algebras and J-Ideals of Groupoids. (Slovak) Theses for habilitation, SjF STU, Bratislava.

[4] ABRHAN I.: On J-subalgebras of unary algebras, on prime ideals and J-ideals of groupoids and semigroups. (Russian), Math. Slovaca 28 (1978), 61-80. | MR

[5] GÉCZEG F., PEÁK I.: Algebraic Theory of Automata. Acad. Kiadó, Budapest, 1972. | MR