Nonlinear Analysis: Real World Applications > 2012 > 13 > 3 > 1093-1101
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journal ISSN : | 1468-1218 |
DOI | 10.1016/j.nonrwa.2011.07.008 |
Nonlinear Analysis: Real World Applications > 2012 > 13 > 3 > 1093-1101
journal ISSN : | 1468-1218 |
DOI | 10.1016/j.nonrwa.2011.07.008 |