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Discussiones Mathematicae, Differential Inclusions, Control and Optimization > 1996 > 16 > 2 > 137-151
Banach Center Publications > 1995 > 32 > 1 > 287-300
Discussiones Mathematicae, Differential Inclusions, Control and Optimization > 1995 > 15 > 1 > 21-28
Discussiones Mathematicae, Differential Inclusions, Control and Optimization > 1995 > 15 > 1 > 75-94