1. Theory of Oscillators;Andronov,1966
2. Introduction to the Theory of Stability;Barbashin,1970
3. Nonlinear Dynamics of Interacting Populations;Bazykin,1998
4. On Some Statistical Methods in Mathematical Physics;Bogoliubov,1945
5. The Application of Methods of Nonlinear Mechanics in the Theory of Stationary Oscillations;Bogoliubov,1934