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Journal of Mathematical Analysis and Applications > 2007 > 327 > 1 > 220-232
Discussiones Mathematicae, Differential Inclusions, Control and Optimization > 1995 > 15 > 1 > 21-28
Discussiones Mathematicae, Differential Inclusions, Control and Optimization > 1995 > 15 > 1 > 75-94