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Nonlinear Analysis > 2011 > 74 > 3 > 901-908
Nonlinear Analysis > 2010 > 72 > 11 > 4082-4090
Journal of Mathematical Analysis and Applications > 2006 > 319 > 2 > 579-603
Journal of Mathematical Analysis and Applications > 2005 > 308 > 2 > 513-531