TY JOUR TI Free van der pol equation KW free Van der Pol equation KW nonlinear dynamical systems KW the simplest systems with dynamical chaos JO Actual directions of scientific researches of the XXI century: theory and practice AU Zuev, S.. PY 2014 IS 2 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov