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Computers and Mathematics with Applications > 2015 > 69 > 5 > 398-410
Journal of Mathematical Analysis and Applications > 2015 > 422 > 2 > 1072-1090
Computers and Mathematics with Applications > 2015 > 69 > 5 > 398-410
Journal of Mathematical Analysis and Applications > 2015 > 422 > 2 > 1072-1090