TY  - BOOK
AU  - Elsgolts,L.E.
TI  - Calculus of variations
T2  - International series of monographs in pure and applied mathematics
AV  - QA315 E513 1962
PY  - 1962///
CY  - London, Reading, Massachusetts
PB  - Pergamon Press, Addison-Wesley
KW  - Cálculo de variaciones
ER  -