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Computers and Mathematics with Applications > 2009 > 58 > 2 > 348-359
Nonlinear Analysis > 2008 > 68 > 12 > 3665-3678
Computers and Mathematics with Applications > 2009 > 58 > 2 > 348-359
Nonlinear Analysis > 2008 > 68 > 12 > 3665-3678