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References:
[1] B. Zelinka: Tolerance in algebraic structures. Czech. Math. J. 20 (1970), 179-183. MR 0260653 | Zbl 0197.01002
[2] B. Zelinka: Tolerance in algebraic structures II. Czech. Math. J. 25 (1975), 175-178. MR 0457323 | Zbl 0316.08001
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