@article{DE_1967_3_2_a13,
     author = {N. V. Krylov},
     title = {The first boundary value problem for elliptic equations of second order},
     journal = {Differencialʹnye uravneni\^a},
     pages = {315--326},
     publisher = {mathdoc},
     volume = {3},
     number = {2},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1967_3_2_a13/}
}