TY  - BOOK
AU  - Ding Tongren
TI  - Approaches to the Qualitative Theory of Ordinary Differential Equations: Dynamical Systems and Nonlinear Oscillations
SN  - 9789812779816
PB  - World Scientific
KW  - Mathematics
UR  - https://www.worldscientific.com/worldscibooks/10.1142/6348#t=toc
ER  -