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Journal of Mathematical Analysis and Applications > 2010 > 366 > 1 > 202-217
Computers and Mathematics with Applications > 2009 > 58 > 2 > 348-359
Journal of Mathematical Analysis and Applications > 2010 > 366 > 1 > 202-217
Computers and Mathematics with Applications > 2009 > 58 > 2 > 348-359