TY  - BOOK
AU  - Weinstock, Robert
TI  - Calculus of variations: With applications to physics and engineering 
T2  - International series in pure and applied mathematics
AV  - QA315 W44 1952
PY  - 1952///
CY  - New York
PB  - McGraw-Hill
KW  - Cálculo de variaciones
ER  -