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Journal of the Egyptian Mathematical Society > 2013 > 21 > 3 > 194-196
Acta Mathematica Hungarica > 2010 > 126 > 3 > 199-208
Journal of Mathematical Analysis and Applications > 2005 > 304 > 2 > 772-782
Journal of the Egyptian Mathematical Society > 2013 > 21 > 3 > 194-196
Acta Mathematica Hungarica > 2010 > 126 > 3 > 199-208
Journal of Mathematical Analysis and Applications > 2005 > 304 > 2 > 772-782