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Journal of Mathematical Analysis and Applications > 2008 > 337 > 1 > 281-291
Journal of Mathematical Analysis and Applications > 2007 > 326 > 1 > 352-362
Journal of Mathematical Analysis and Applications > 2008 > 337 > 1 > 281-291
Journal of Mathematical Analysis and Applications > 2007 > 326 > 1 > 352-362