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Open Mathematics > 2014 > 12 > 6 > 911-922
Discussiones Mathematicae, Differential Inclusions, Control and Optimization > 1999 > 19 > 1-2 > 111-121
Open Mathematics > 2014 > 12 > 6 > 911-922
Discussiones Mathematicae, Differential Inclusions, Control and Optimization > 1999 > 19 > 1-2 > 111-121