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Annales UMCS, Mathematica > 2014 > 68 > 1 > 59-66
Annales UMCS, Mathematica > 2013 > 67 > 2 > 65-78
Annales UMCS, Mathematica > 2012 > 66 > 1 > 13-23
Annales UMCS, Mathematica > 2010 > 64 > 2 > 29-35
Annales UMCS, Mathematica > 2009 > 63 > 1 > 1-16
Annales UMCS, Mathematica > 2008 > 62 > 1 > 1-13
Annales UMCS, Mathematica > 2008 > 62 > 1 > 15-29
Studia Mathematica > 1994 > 109 > 3 > 233-254