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On fuzzy $(1,2)$-ideals in semigroups. II
Lajos, S., (1997)
$\Gamma$-filters and semilattice $\Gamma$-congruences in po-$\Gamma$-semigroups
Jun, Y.B., (1997)
Some remarks on $(m,n)$-commutative semigroups
Lajos, S., (1992)