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Journal of Mathematical Analysis and Applications > 2013 > 406 > 1 > 237-242
Journal of Mathematical Analysis and Applications > 2007 > 329 > 1 > 736-751
Journal of Mathematical Analysis and Applications > 2013 > 406 > 1 > 237-242
Journal of Mathematical Analysis and Applications > 2007 > 329 > 1 > 736-751