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Journal of Mathematics and Applications > 2013 > Vol. 36 > 71--77
Journal of Mathematics and Applications > 2011 > Vol. 34 > 109--116
Journal of Mathematical Analysis and Applications > 2008 > 337 > 2 > 1261-1266
Journal of Computational and Applied Mathematics > 2006 > 193 > 2 > 638-651
Applied Mathematics and Computation > 2003 > 142 > 2-3 > 243-253