TY  - BOOK
AU  - Elsgolts, L.
TI  - Differential equations and the calculus of variations
U1  - 515.35 
PY  - 1977///
CY  - Moscow
PB  - Mir Publishers
KW  - Differential equations
KW  - Linear equations
KW  - Mathematical analysis
N1  - Includes index
ER  -