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Journal of Mathematical Analysis and Applications > 2000 > 248 > 2 > 520-531
Computers and Mathematics with Applications > 2000 > 39 > 12 > 11-18
Results in Mathematics > 2000 > 38 > 1-2 > 9-17
Discussiones Mathematicae, Differential Inclusions, Control and Optimization > 1999 > 19 > 1-2 > 111-121