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Tolerance numbers, congruence $n$-permutability and BCK-algebras
Czechoslovak Mathematical Journal, Tome 42 (1992) no. 4, pp. 727-740
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DOI : 10.21136/CMJ.1992.128368
Classification : 06F35, 08A02, 08A30, 08B05 
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Raftery, J. G.; Sturm, T. Tolerance numbers, congruence $n$-permutability and BCK-algebras. Czechoslovak Mathematical Journal, Tome 42 (1992) no. 4, pp. 727-740. doi: 10.21136/CMJ.1992.128368

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