@article{DAN_1966_170_4_a5,
     author = {Yu. V. Egorov and V. A. Kondratiev},
     title = {On an oblique derivative problem},
     journal = {Doklady Akademii Nauk},
     pages = {770--772},
     publisher = {mathdoc},
     volume = {170},
     number = {4},
     year = {1966},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1966_170_4_a5/}
}