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International Journal of Theoretical Physics > 2005 > 44 > 7 > 735-744
Discussiones Mathematicae - General Algebra and Applications > 2004 > 24 > 1 > 137-147
International Journal of Theoretical Physics > 2005 > 44 > 7 > 735-744
Discussiones Mathematicae - General Algebra and Applications > 2004 > 24 > 1 > 137-147