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International Journal of Applied Mathematics and Computer Science > 2007 > 17 > 4 > 549-563
Discussiones Mathematicae, Differential Inclusions, Control and Optimization > 2001 > 21 > 2 > 261-282
International Journal of Applied Mathematics and Computer Science > 2007 > 17 > 4 > 549-563
Discussiones Mathematicae, Differential Inclusions, Control and Optimization > 2001 > 21 > 2 > 261-282