TY  - BOOK
AU  - Él'sgol'c, L. É.
TI  - Differential equations and the calculus of variations
PY  - 1970///
CY  - Μ.
PB  - Mir
KW  - Мт270[В161.6, 0]
KW  - rubbk
KW  - Мт-590[В161.8, 0]
N2  - "Recommended literature": с. 436
ER  -