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Journal of Mathematical Analysis and Applications > 2011 > 384 > 2 > 431-438
Journal of Mathematical Analysis and Applications > 2011 > 373 > 1 > 227-234
Aequationes mathematicae > 2011 > 82 > 3 > 247-253
Journal of Mathematical Analysis and Applications > 2011 > 384 > 2 > 431-438
Journal of Mathematical Analysis and Applications > 2011 > 373 > 1 > 227-234
Aequationes mathematicae > 2011 > 82 > 3 > 247-253