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Opuscula Mathematica > 2024 > Vol. 44, no. 3 > 341--357
Opuscula Mathematica > 2014 > Vol. 34, no. 3 > 561--567
Demonstratio Mathematica > 2013 > Vol. 46, nr 3 > 571--583
Opuscula Mathematica > 2024 > Vol. 44, no. 3 > 341--357
Opuscula Mathematica > 2014 > Vol. 34, no. 3 > 561--567
Demonstratio Mathematica > 2013 > Vol. 46, nr 3 > 571--583