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Demonstratio Mathematica > 2009 > Vol. 42, nr 1 > 53-64
Fasciculi Mathematici > 2004 > Nr 34 > 157-167
Journal of Applied Analysis > 2003 > Vol. 9, nr 2 > 201-209
Demonstratio Mathematica > 2009 > Vol. 42, nr 1 > 53-64
Fasciculi Mathematici > 2004 > Nr 34 > 157-167
Journal of Applied Analysis > 2003 > Vol. 9, nr 2 > 201-209