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Nonlinear Analysis: Theory, Methods & Applications > 2015 > 128 > C > 423-426
Nonlinear Analysis > 2014 > 98 > Complete > 146-164
Nonlinear Analysis: Theory, Methods & Applications > 2015 > 128 > C > 423-426
Nonlinear Analysis > 2014 > 98 > Complete > 146-164