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Computers and Mathematics with Applications > 2015 > 69 > 7 > 582-591
Journal of Mathematical Analysis and Applications > 2013 > 402 > 1 > 71-83
Nonlinear Analysis > 2013 > 81 > Complete > 42-53
Nonlinear Analysis > 2008 > 69 > 4 > 1445-1453
Nonlinear Analysis > 2004 > 59 > 1-2 > 173-188