TY  - BOOK
AU  - Lefschetz,Solomon
AU  - Bers,L.
AU  - Stoker,J.J.
TI  - Differential equations : geometric theory 
U1  - 517.38 LEF  
PY  - 1807///.
CY  - New York : 
PB  - Interscience Publishers, 
KW  - Differential equations
KW  - Topology
N1  - Includes index.
ER  -