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Journal of Mathematical Analysis and Applications > 2015 > 428 > 2 > 1368-1376
Functional Analysis and Its Applications > 2015 > 49 > 4 > 304-306
Nonlinear Analysis > 2012 > 75 > 8 > 3552-3557
Journal of Mathematical Analysis and Applications > 2015 > 428 > 2 > 1368-1376
Functional Analysis and Its Applications > 2015 > 49 > 4 > 304-306
Nonlinear Analysis > 2012 > 75 > 8 > 3552-3557