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Mathematica Slovaca > 2012 > 62 > 6 > 1145-1166
Open Mathematics > 2011 > 9 > 6 > 1298-1311
Central European Journal of Mathematics > 2011 > 9 > 6 > 1298-1311
Mathematica Slovaca > 2012 > 62 > 6 > 1145-1166
Open Mathematics > 2011 > 9 > 6 > 1298-1311
Central European Journal of Mathematics > 2011 > 9 > 6 > 1298-1311