TY  - BOOK
AU  - Intl. Sympoisum held at United States Air Force Academy, Colorado, 31 July - 4 August, 1961
AU  - Lasalle, Joseph P., ed.
AU  - Lefschetz, Solomon., ed.
TI  - Nonlinear differential equations and nonlinear mechanics - Proceedings
U1  - 515.35 
PY  - 1963///
CY  - New York
PB  - Academic Press
ER  -