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Differential Equations and Dynamical Systems > 2018 > 26 > 1-3 > 139-155
Differential Equations and Dynamical Systems > 2016 > 24 > 2 > 189-200
Journal of Mathematics and Applications > 2016 > Vol. 39 > 23--45
Discussiones Mathematicae, Differential Inclusions, Control and Optimization > 2014 > 34 > 2 > 153-167
Opuscula Mathematica > 2014 > Vol. 34, no. 3 > 503--522
Commentationes Mathematicae > 2013 > Vol 53, No. 1 > 47--59