@article{DE_1979_15_11_a14,
     author = {V. M. Filippov},
     title = {A variational method of solution of boundary value problems of mathematical physics, and function spaces},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2056--2065},
     publisher = {mathdoc},
     volume = {15},
     number = {11},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1979_15_11_a14/}
}