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Discussiones Mathematicae, Differential Inclusions, Control and Optimization > 1999 > 19 > 1-2 > 123-129
Discussiones Mathematicae, Differential Inclusions, Control and Optimization > 1997 > 17 > 1-2 > 51-65
Discussiones Mathematicae, Differential Inclusions, Control and Optimization > 1995 > 15 > 1 > 61-42