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Discussiones Mathematicae, Differential Inclusions, Control and Optimization > 1998 > 18 > 1-2 > 69-85
Applied Mathematics Letters > 1997 > 10 > 3 > 53-56
Discussiones Mathematicae, Differential Inclusions, Control and Optimization > 1998 > 18 > 1-2 > 69-85
Applied Mathematics Letters > 1997 > 10 > 3 > 53-56