@article{DAN_1990_311_3_a3,
     author = {S. A. Nazarov and B. A. Plamenevskii},
     title = {Radiation conditions for selfadjoint elliptic problems},
     journal = {Doklady Akademii Nauk},
     pages = {532--536},
     publisher = {mathdoc},
     volume = {311},
     number = {3},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_311_3_a3/}
}