TY  - BOOK
AU  - Elsgolts, L.
TI  - Differential Equations and The Calculus of Variations
U1  - 517.2 
PY  - 1970///
CY  - Moscow
PB  - Mir, Publishers
KW  - Mathematics
KW  - Pure Sciences
KW  - Calculus
KW  - Differential equations
KW  - Variations
ER  -