TY  - BOOK
AU  - Lefschetz,Solomon
TI  - Differential equations: geometric theory 
U1  - 517.38 
PY  - 1946///
CY  - New York
PB  - Interscience Publishers
KW  - Differential equations
KW  - Topology
KW  - Linear systems
KW  - Stability
N1  - Includes bibliographical references and index
ER  -