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Annales UMCS, Mathematica > 2015 > 69 > 1 > 91-108
Annales UMCS, Mathematica > 2014 > 68 > 2
Annales UMCS, Mathematica > 2014 > 68 > 1 > 67-89
Annales UMCS, Mathematica > 2013 > 67 > 1 > 1-10
Annales UMCS, Mathematica > 2012 > 66 > 1 > 1-5
Annales UMCS, Mathematica > 2011 > 65 > 1 > 11-19
Annales UMCS, Mathematica > 2009 > 63 > 1 > 49-53
Open Mathematics > 2005 > 3 > 2 > 294-308