TY  - BOOK
AU  - Lefschetz, Solomon,
AU  - Diliberto, S.P.
TI  - Contributions to the theory of nonlinear oscillations
PY  - 1952///
CY  - Princeton, N.J.
PB  - Princeton University Press
KW  - Oscillations
N1  - Includes bibliographical references and index
ER  -