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Nonlinear Analysis > 2007 > 67 > 7 > 2258-2271
Journal of Mathematical Analysis and Applications > 2007 > 329 > 1 > 336-346
Nonlinear Analysis > 2007 > 67 > 7 > 2258-2271
Journal of Mathematical Analysis and Applications > 2007 > 329 > 1 > 336-346