TY  - BOOK
AU  - Elsgolts, L.
TI  - Differential Equations and the Calculus of Variations
U1  - 517.38 ELS/Dif 
PY  - 1973///
CY  - Moscow
PB  - MIR Publishers
KW  - Differential Equations / Calculus of Variations
N1  - Includes Answers to Problems, Recommended Literature and Index
ER  -