TY  - BOOK
AU  - Elsgolts,L.
TI  - Differential equations and the calculus of variations
PY  - 1970///
CY  - Moscow
PB  - Mir Publishers
KW  - Differential equations
KW  - Calculus of variations
N1  - Translation of Different͡s︡ialʹnye uravnenii͡a︡ i variat͡s︡ionnoe ischislenie
ER  -