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Lobachevskii Journal of Mathematics > 2019 > 40 > 8 > 1113-1121
Lecture Notes in Computer Science > Knowledge Science, Engineering and Management > Regular Papers > 229-240
Acta Mathematica Hungarica > 2013 > 140 > 1-2 > 1-11
Semigroup Forum > 2011 > 83 > 2 > 320-334
Advances in Mathematics > 2007 > 216 > 2 > 610-625
Journal of Algebra > 2007 > 311 > 1 > 96-116
Algebra universalis > 2005 > 54 > 3 > 349-371