TY  - BOOK
AU  - Lanczos, Cornelius.
AU  - 
TI  - The variational principles of mechanics
U1  - 530.1 
PY  - 1986///
CY  - New York
PB  - Dover
N1  - "Unabridged republication of the 4th ed. published by Univ. of Toronto Pr., Toronto, 1970"
ER  -