1. The point transformation method in the theory of non-linear oscillations;Neimark,1963
2. Additional Chapters on the Theory of Ordinary Differential Equations;Arnol'd,1978
3. Some cases of loss of control of the motion of a symmetric system;Feigin;Prikl. Mat. Mekh.,1982
4. Methods of Analysing Non-linear Dynamical Models;Holodniok,1986
5. On the structure of C-bifurcation boundaries of piecewise-continuous systems;Feigin;Prikl. Mat. Mekh.,1978