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Demonstratio Mathematica > 2012 > Vol. 45, nr 3 > 561-573
Demonstratio Mathematica > 2011 > Vol. 44, nr 2 > 317-333
Nonlinear Analysis > 2009 > 71 > 7-8 > 2936-2943
Discussiones Mathematicae, Differential Inclusions, Control and Optimization > 2009 > 29 > 1 > 113-126