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Applied Mathematics Letters > 2011 > 24 > 10 > 1685-1692
Nonlinear Analysis > 2009 > 71 > 3-4 > 1082-1093
Journal of Mathematical Analysis and Applications > 2001 > 262 > 2 > 499-528
Applied Mathematics Letters > 2011 > 24 > 10 > 1685-1692
Nonlinear Analysis > 2009 > 71 > 3-4 > 1082-1093
Journal of Mathematical Analysis and Applications > 2001 > 262 > 2 > 499-528