@article{DAN_1983_273_6_a4,
     author = {A. I. Ibragimov},
     title = {On the solvability of a mixed problem for second-order elliptic},
     journal = {Doklady Akademii Nauk},
     pages = {1305--1307},
     publisher = {mathdoc},
     volume = {273},
     number = {6},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1983_273_6_a4/}
}