@article{DAN_1969_188_6_a0,
     author = {A. I. Achildiev},
     title = {Charateristic functions of the first boundary value problem for el\-liptic equations degenerating at certain points},
     journal = {Doklady Akademii Nauk},
     pages = {1207--1209},
     publisher = {mathdoc},
     volume = {188},
     number = {6},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_188_6_a0/}
}