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Demonstratio Mathematica > 2014 > Vol. 47, nr 3 > 672--694
International Journal of Theoretical Physics > 2013 > 52 > 6 > 2118-2127
Linear Algebra and Its Applications > 2006 > 413 > 1 > 93-99
Demonstratio Mathematica > 2014 > Vol. 47, nr 3 > 672--694
International Journal of Theoretical Physics > 2013 > 52 > 6 > 2118-2127
Linear Algebra and Its Applications > 2006 > 413 > 1 > 93-99