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Applied Mathematics Letters > 2011 > 24 > 10 > 1685-1692
Nonlinear Analysis: Real World Applications > 2011 > 12 > 2 > 1062-1071
Journal of Mathematical Analysis and Applications > 2011 > 374 > 2 > 644-654
Applied Mathematics Letters > 2011 > 24 > 10 > 1685-1692
Nonlinear Analysis: Real World Applications > 2011 > 12 > 2 > 1062-1071
Journal of Mathematical Analysis and Applications > 2011 > 374 > 2 > 644-654