1. Department of Differential Equations Oles Honchar Dnipro National University Dnipro Ukraine
2. Department of System Analysis and Control National Technical University “Dnipro Polytechnics” Dnipro Ukraine
3. Institute of Applied and System Analysis Ihor Sikorsky National Technical University of Ukraine “Kiev Polytechnical Institute” Kiev Ukraine
4. Department Mathematik Lehrstuhl II Universität Erlangen‐Nürnberg Erlangen Germany