TY JOUR TI Problems of modelling and analysis in singularly perturbed systems dynamics KW small parameter KW stability KW singular KW perturbation JO Actual directions of scientific researches of the XXI century: theory and practice AU Kuzmina, L.. PY 2014 IS 2 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov