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Annales UMCS, Mathematica > 2010 > 64 > 1 > 1-16
Annales UMCS, Mathematica > 2010 > 64 > 2 > 1-14
Annales UMCS, Mathematica > 2009 > 63 > 1 > 17-27
Annales UMCS, Mathematica > 2010 > 64 > 1 > 1-16
Annales UMCS, Mathematica > 2010 > 64 > 2 > 1-14
Annales UMCS, Mathematica > 2009 > 63 > 1 > 17-27