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Nonlinear Analysis > 2011 > 74 > 18 > 7395-7403
Journal of Mathematical Analysis and Applications > 2011 > 379 > 1 > 171-179
Nonlinear Analysis > 2011 > 74 > 18 > 7395-7403
Journal of Mathematical Analysis and Applications > 2011 > 379 > 1 > 171-179