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Nonlinear Analysis > 2009 > 71 > 12 > e1094-e1099
Discussiones Mathematicae, Differential Inclusions, Control and Optimization > 2008 > 28 > 1 > 165-189
Nonlinear Analysis > 2009 > 71 > 12 > e1094-e1099
Discussiones Mathematicae, Differential Inclusions, Control and Optimization > 2008 > 28 > 1 > 165-189