@article{DAN_1992_323_2_a11,
     author = {B. Yu. Sternin and V. E. Shatalov},
     title = {A class of nonlocal elliptic problems},
     journal = {Doklady Akademii Nauk},
     pages = {245--249},
     year = {1992},
     volume = {323},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1992_323_2_a11/}
}