TY  - BOOK
AU  - Lefschetz,Solomon
AU  - Cesari,Lamberto
TI  - Contributions to the theory of nonlinear oscillations
T2  - Annals of mathematics studies,
U1  - 531.32 
PY  - 1956///
CY  - Princeton
PB  - Princeton University Press
KW  - Oscillations
N1  - Vol. 5 edited by L. Cesari, J. LaSalle, and S. Lefschetz; Includes bibliographies; Vol.1--
ER  -