@article{AA_1992_4_3_a8,
     author = {S. A. Nazarov and B. A. Plamenevskii},
     title = {Selfadjoint elliptic problems with radiation conditions on the edges of the boundary},
     journal = {Algebra i analiz},
     pages = {196--225},
     year = {1992},
     volume = {4},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_1992_4_3_a8/}
}