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Demonstratio Mathematica > 2019 > Vol. 52, nr 1 > 410--427
Demonstratio Mathematica > 2014 > Vol. 47, nr 2 > 352--370
Opuscula Mathematica > 2009 > Vol. 29, no. 2 > 139-145
Demonstratio Mathematica > 2001 > Vol. 34, nr 1 > 91-103