1. Université Clermont Auvergne, CNRS, SIGMA Clermont, Institut Pascal F‐63000 Clermont‐Ferrand France
2. Department of Theoretical and Computational MechanicsOles Honchar Dnipro National University Gagarin Av., 72 Dnipro 49010 Ukraine
3. Department of Computational MathematicsOles Honchar Dnipro National University Gagarin Av., 72 Dnipro 49010 Ukraine