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Z. Hedrlín andA. Pultr, Relations (Graphs) with given finitely generated semigroups, Mh. Mathematik,68, 213–217 (1964).
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Pultr, A., Hedrlín, Z. Relations (graphs) with given infinite semigroups. Monatshefte für Mathematik 68, 421–425 (1964). https://doi.org/10.1007/BF01304185
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DOI: https://doi.org/10.1007/BF01304185