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Open Mathematics > 2007 > 5 > 3 > 493-504
Central European Journal of Mathematics > 2007 > 5 > 3 > 493-504
Annals of Global Analysis and Geometry > 2005 > 28 > 1 > 75-89
Open Mathematics > 2007 > 5 > 3 > 493-504
Central European Journal of Mathematics > 2007 > 5 > 3 > 493-504
Annals of Global Analysis and Geometry > 2005 > 28 > 1 > 75-89