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Nonlinear Analysis: Hybrid Systems > 2010 > 4 > 3 > 524-530
Journal of Computational and Applied Mathematics > 2010 > 233 > 8 > 2062-2070
Journal of Mathematical Analysis and Applications > 2008 > 341 > 1 > 1-11
Journal of Mathematical Analysis and Applications > 2007 > 328 > 2 > 821-829