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References:
[1] V. R. Chandran: On a problem of B. Zelinka. Czechoslovak Math. J. 37 (112), (1987), 124. MR 0875133 | Zbl 0625.20050
[2] B. Zelinka: Tolerances in algebraic structures. Czechosl. Math. J. Vol. 25 (100),(1975), 175-178. MR 0457323
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