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Journal of Mathematical Analysis and Applications > 2007 > 331 > 2 > 978-985
Nonlinear Analysis > 2007 > 66 > 6 > 1378-1387
Journal of Mathematical Analysis and Applications > 2007 > 331 > 2 > 978-985
Nonlinear Analysis > 2007 > 66 > 6 > 1378-1387