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References:
[1] Petrich M.: Introduction to Semigroups. Merrill Publishing Co., Ohio (1973). MR 0393206 | Zbl 0321.20037
[2] Zelinka В.: Tolerances in algebraic structures. Czech. Math. J. 20 (1970), 179-183. MR 0260653
[3] Zelinka В.: Tolerances in algebraic structures II. Czech. Math. J. 25 (1975), 175-178. MR 0457323
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