1. Collected Papers. Moscow 1956.
2. et al., Theory of Bifuractions of Dynamic Systems on a Plane. John Wiley & Sons, New York 1970.
3. Modeling and Control in the Biomedical Sciences
4. & , Qualitative Theory of Ordinary Differential Equations. W. A. Benjamin, Inc., New York 1969.
5. Integral averaging and bifurcation