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Discussiones Mathematicae - General Algebra and Applications > 2015 > 35 > 2 > 119-128
Acta Mathematica Sinica, English Series > 2012 > 28 > 10 > 2115-2128
Discussiones Mathematicae - General Algebra and Applications > 2015 > 35 > 2 > 119-128
Acta Mathematica Sinica, English Series > 2012 > 28 > 10 > 2115-2128