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Journal of Mathematical Analysis and Applications > 2007 > 325 > 1 > 608-611
Journal of Mathematical Analysis and Applications > 2004 > 299 > 2 > 433-447
Journal of Mathematical Analysis and Applications > 2007 > 325 > 1 > 608-611
Journal of Mathematical Analysis and Applications > 2004 > 299 > 2 > 433-447