TY  - BOOK
AU  - Lanczos, Cornelius
TI  - The variational principles of mechanics
T2  - Dover books on physics and chemistry
SN  - 0486650677
U1  - 531.0151 
PY  - 1986///
CY  - New York
PB  - Dover Publications
KW  - MecÃ¡nica clÃ¡sica
KW  - MecÃ¡nica de sÃ³lidos
ER  -