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Applied Mathematics and Computation > 2013 > 219 > 9 > 4551-4559
Chinese Annals of Mathematics, Series B > 2012 > 33 > 2 > 191-206
Physics Letters A > 2009 > 373 > 12-13 > 1121-1129
Applied Mathematics and Computation > 2013 > 219 > 9 > 4551-4559
Chinese Annals of Mathematics, Series B > 2012 > 33 > 2 > 191-206
Physics Letters A > 2009 > 373 > 12-13 > 1121-1129