@article{DE_1969_5_3_a12,
     author = {N. J. Yurchuk},
     title = {A partially characteristic boundary value problem for a certain form of partial differential {equations.~II}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {531--542},
     year = {1969},
     volume = {5},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1969_5_3_a12/}
}