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Open Mathematics > 2010 > 8 > 6 > 1091-1103
Open Mathematics > 2009 > 7 > 2 > 322-334
Colloquium Mathematicum > 2000 > 83 > 1 > 21-41
Annales Polonici Mathematici > 1992 > 57 > 3 > 219-229
Open Mathematics > 2010 > 8 > 6 > 1091-1103
Open Mathematics > 2009 > 7 > 2 > 322-334
Colloquium Mathematicum > 2000 > 83 > 1 > 21-41
Annales Polonici Mathematici > 1992 > 57 > 3 > 219-229