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Open Mathematics > 2016 > 14 > 1 > 557-566
Annales UMCS, Mathematica > 2012 > 66 > 2 > 31-46
Annales UMCS, Mathematica > 2012 > 66 > 1 > 63-72
Open Mathematics > 2016 > 14 > 1 > 557-566
Annales UMCS, Mathematica > 2012 > 66 > 2 > 31-46
Annales UMCS, Mathematica > 2012 > 66 > 1 > 63-72