@article{DE_1977_13_1_a5,
     author = {T. D. Dzhuraev and A. Sabirov},
     title = {Certain boundary value problems for equations of composite type},
     journal = {Differencialʹnye uravneni\^a},
     pages = {36--43},
     publisher = {mathdoc},
     volume = {13},
     number = {1},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_1_a5/}
}