@article{DAN_1973_209_5_a1,
     author = {I. A. Bikchantaev},
     title = {Some boundary value problems for an elliptic equation},
     journal = {Doklady Akademii Nauk},
     pages = {1013--1016},
     year = {1973},
     volume = {209},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1973_209_5_a1/}
}