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Journal of Mathematical Analysis and Applications > 2012 > 393 > 2 > 479-488
Mediterranean Journal of Mathematics > 2012 > 9 > 1 > 199-210
Advances in Difference Equations > 2011 > 2011 > 1 > 1-12
Computers and Mathematics with Applications > 2010 > 60 > 11 > 2971-2982
Nonlinear Analysis > 2010 > 73 > 9 > 3130-3139