@article{DAN_1970_193_6_a3,
     author = {G. D. Karatoprakliev},
     title = {Existence of weak solutions of a certain boundary value problem for an equation of mixed type in multidimensional domains},
     journal = {Doklady Akademii Nauk},
     pages = {1226--1229},
     publisher = {mathdoc},
     volume = {193},
     number = {6},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1970_193_6_a3/}
}