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[1] J. de GROOT: Groups represented by homeomorphism groups I. Math. Annalen 138 (1959), 80-102. MR 0119193 | Zbl 0087.37802
[2] Z. HEDRLÍN A. PULTR: Relations (Graphs) with given finitely generated semigroups. to appear in Monatshefte für Matematik. MR 0168684
[3] A. PULTR Z. HEDRLÍN: Relations (Graphs) with given infinite semigroups. submitted to Monatshefte für Mathematik.
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