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Open Mathematics > 2016 > 14 > 1 > 452-473
Open Mathematics > 2016 > 14 > 1 > 497-508
Open Mathematics > 2016 > 14 > 1 > 1125-1137
Discussiones Mathematicae, Differential Inclusions, Control and Optimization > 2015 > 35 > 2 > 151-164
Open Mathematics > 2015 > 13 > 1
Open Mathematics > 2015 > 13 > 1
Discussiones Mathematicae, Differential Inclusions, Control and Optimization > 2013 > 33 > 1 > 17-39
International Journal of Applied Mathematics and Computer Science > 2012 > 22 > 3 > 523-531
International Journal of Applied Mathematics and Computer Science > 2012 > 22 > 3 > 523-531