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Afrika Matematika > 2016 > 27 > 7-8 > 1199-1212
Applied Mathematics and Computation > 2015 > 252 > Complete > 294-303
Journal of Mathematical Analysis and Applications > 2014 > 413 > 1 > 450-457
Journal of Mathematical Analysis and Applications > 2007 > 329 > 2 > 1191-1203
Journal of Mathematical Analysis and Applications > 2004 > 299 > 2 > 375-391