TY  - BOOK
AU  - Nemytskii,V.V & Stepanov,V.V
ED  - Stepanov, V.V
TI  - Qualitative theory of differential equations
T2  - Princeton mathematical series 22
U1  - 10.01 
PY  - 1960///
CY  - New Jersey
PB  - Princeton University Press
ER  -