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International Journal of Applied Mathematics and Computer Science > 2014 > 24 > 3 > 635-646
International Journal of Applied Mathematics and Computer Science > 2011 > 21 > 1 > 127-135
Open Mathematics > 2009 > 7 > 3 > 487-492
International Journal of Applied Mathematics and Computer Science > 2007 > 17 > 4 > 471-475
Discussiones Mathematicae, Differential Inclusions, Control and Optimization > 2000 > 20 > 1 > 51-62