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Demonstratio Mathematica > 2011 > Vol. 44, nr 3 > 615-627
Discussiones Mathematicae - General Algebra and Applications > 2010 > 30 > 2 > 147-171
Demonstratio Mathematica > 2011 > Vol. 44, nr 3 > 615-627
Discussiones Mathematicae - General Algebra and Applications > 2010 > 30 > 2 > 147-171