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Demonstratio Mathematica > 2015 > Vol. 48, nr 4 > 546--553
Linear Algebra and Its Applications > 2000 > 321 > 1-3 > 239-280
Demonstratio Mathematica > 2015 > Vol. 48, nr 4 > 546--553
Linear Algebra and Its Applications > 2000 > 321 > 1-3 > 239-280