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Chinese Annals of Mathematics, Series B > 2012 > 33 > 2 > 309-316
Journal of Mathematical Analysis and Applications > 2010 > 366 > 2 > 460-472
Applied Mathematics and Computation > 2010 > 216 > 8 > 2293-2300
Journal of Mathematical Analysis and Applications > 2004 > 297 > 1 > 317-342