TY  - BOOK
AU  - Zhi-fen, Zhang
ED  - WIng-Kwok Leung, Anthony
TI  - Qualitative theory of differential equations
T2  - Translations of mathematical monographs
SN  - 0821845519
U1  - 515.35, 
PY  - 1991///
CY  - Providence
PB  - American Mathematical Society
ER  -