Geodesic
Expansion in eigenfunctions of a nonselfadjoint differential operator of an exterior boundary value problem
Differencialʹnye uravneniâ, Tome 7 (1971) no. 4, pp. 737-742 
A. G. Ramm. Expansion in eigenfunctions of a nonselfadjoint differential operator of an exterior boundary value problem. Differencialʹnye uravneniâ, Tome 7 (1971) no. 4, pp. 737-742. http://geodesic.mathdoc.fr/item/DE_1971_7_4_a12/
@article{DE_1971_7_4_a12,
     author = {A. G. Ramm},
     title = {Expansion in eigenfunctions of a nonselfadjoint differential operator of an exterior boundary value problem},
     journal = {Differencialʹnye uravneni\^a},
     pages = {737--742},
     year = {1971},
     volume = {7},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_4_a12/}
}
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