@article{DE_1987_23_9_a15,
     author = {V. M. Filippov},
     title = {Semibounded solutions of inverse problems of the calculus of variations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1599--1607},
     publisher = {mathdoc},
     volume = {23},
     number = {9},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1987_23_9_a15/}
}