TY  - BOOK
AU  - edited by Lefschetz, S. 
TI  - Contributions to the theory of nonlinear oscillations, vol-IV
SN  - 9780691079325
U1  - 517.912 
PY  - 1958///
CY  - Princeton
PB  - PUP
KW  - MATHEMATICS
KW  - NONLINEAR OSCILLATIONS
KW  - DIFFERENTIAL EQUATIONS
ER  -