@article{DAN_1964_154_6_a4,
     author = {B. V. Melent'ev},
     title = {A boundary-value problem for equations of mixed type},
     journal = {Doklady Akademii Nauk},
     pages = {1262--1265},
     year = {1964},
     volume = {154},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_154_6_a4/}
}