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Discussiones Mathematicae, Differential Inclusions, Control and Optimization > 2003 > 23 > 1 > 53-74
Annales Polonici Mathematici > 1995 > 62 > 2 > 123-142
Annales Polonici Mathematici > 1993 > 58 > 1 > 65-83
Annales Polonici Mathematici > 1992 > 57 > 1 > 71-82