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Fractional Calculus and Applied Analysis > 2011 > 14 > 2 > 164-200
Discussiones Mathematicae, Differential Inclusions, Control and Optimization > 2009 > 29 > 1 > 19-42
Control and Cybernetics > 2007 > Vol. 36, no 3 > 841-857
Demonstratio Mathematica > 1998 > Vol. 31, nr 4 > 887-898