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Nonlinear Analysis > 2010 > 72 > 11 > 4211-4220
Computers and Mathematics with Applications > 2005 > 49 > 4 > 589-598
Nonlinear Analysis > 2010 > 72 > 11 > 4211-4220
Computers and Mathematics with Applications > 2005 > 49 > 4 > 589-598