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International Journal of Applied Mathematics and Computer Science > 2009 > 19 > 1 > 143-150
Discussiones Mathematicae - General Algebra and Applications > 2005 > 25 > 2 > 165-219
International Journal of Applied Mathematics and Computer Science > 2009 > 19 > 1 > 143-150
Discussiones Mathematicae - General Algebra and Applications > 2005 > 25 > 2 > 165-219