TY  - BOOK
AU  - Lefschetz.S.
TI  - Contributiona to the Theory of Nonlinear Ocillations
PY  - 1950///
CY  - Princeton
PB  - Princeton University Press
KW  - Statistics,Ocillation of a Third Order Nonlinear Autonomous System, Forced Osillations in Nonlinear Systems
ER  -