@article{DE_1976_12_1_a4,
     author = {Z. D. Dublya},
     title = {Boundary value problems for equations of the type of {Humbert's} equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {36--40},
     year = {1976},
     volume = {12},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1976_12_1_a4/}
}