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Annales UMCS, Mathematica > 2013 > 67 > 2 > 65-78
Annales UMCS, Mathematica > 2013 > 67 > 1 > 83-101
Annales UMCS, Mathematica > 2012 > 66 > 2 > 57-62
Annales UMCS, Mathematica > 2009 > 63 > 1 > 1-16
Annales Polonici Mathematici > 1998 > 68 > 2 > 107-117
Annales Polonici Mathematici > 1994-1995 > 60 > 3 > 289-297