TY  - BOOK
AU  - Ding,Tong-Ren
TI  - Approaches to the qualitative theory of ordinary differential equations: dynamical systems and nonlinear oscillations 
T2  - Peking University series in mathematics
SN  - 9789812704689
PY  - 2007///
CY  - New Jersey
PB  - World Scientific
KW  - Differential equations, Nonlinear
KW  - Textbooks
KW  - Nonlinear oscillations
N1  - Includes bibliographical references (p. 377-383); Advanced undergraduate and graduate students
ER  -