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Chinese Annals of Mathematics, Series B > 2017 > 38 > 5 > 1179-1196
Mathematical and Computer Modelling > 2009 > 49 > 3-4 > 556-562
Journal of Mathematical Analysis and Applications > 2008 > 345 > 2 > 934-940
Computers and Mathematics with Applications > 2007 > 53 > 11 > 1704-1717