TY  - BOOK
AU  - Lefschetz,Solomon
AU  - Cesari,Lamberto
TI  - Contributions to the theory of nonlinear oscillations /  
T2  - Annals of mathematics studies, ; 
U1  - 531.3 
PY  - 1952///
CY  - Princeton : 
PB  - Princeton University Press, 
KW  - OSCILACIONES
N1  - Vol. 5 edited by L. Cesari, J. LaSalle, and S. Lefschetz
ER  -