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Author: Polák, Libor

• Polák, Libor: A classification of rational languages by semilattice-ordered monoids. (English). Archivum Mathematicum, vol. 40 (2004), issue 4, pp. 395-406
• Polák, Libor: On varieties of non-indexed algebras. (English). Archivum Mathematicum, vol. 13 (1977), issue 3, pp. 169-174