TY  - BOOK
AU  - Ding, Tong-Ren.
TI  - Approaches to the qualitative theory of ordinary differential equations: dynamical systems and nonlinear oscillations
SN  - 9789812704689
U1  - 515.352 
PY  - 2007///
CY  - New Jersey
PB  - World Scientific
KW  - Differential Equations, Nonlinear--Textbooks. 2. Nonlinear Oscillations--Textbooks
ER  -