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References:
[1] S. M. Bogdanović M. D. Ćirić: Polugrupe. Prosveta Niš, 1993. (In Serbo-Croatian.)
[2] B. Zelinka: Tolerance in algebraic structures. Czechoslovak Math. J. 20 (1970), 179-183. MR 0260653 | Zbl 0197.01002
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