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Journal of Dynamical and Control Systems > 2015 > 21 > 3 > 401-422
Demonstratio Mathematica > 2015 > Vol. 48, nr 2 > 250--288
Journal of Dynamical and Control Systems > 2015 > 21 > 3 > 401-422
Demonstratio Mathematica > 2015 > Vol. 48, nr 2 > 250--288