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@article{DAN_1968_183_4_a14, author = {R. A. Shirikyan}, title = {The spectrum of nonselfadjoint differential operators}, journal = {Doklady Akademii Nauk}, pages = {791--792}, publisher = {mathdoc}, volume = {183}, number = {4}, year = {1968}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1968_183_4_a14/} }
R. A. Shirikyan. The spectrum of nonselfadjoint differential operators. Doklady Akademii Nauk, Tome 183 (1968) no. 4, pp. 791-792. http://geodesic.mathdoc.fr/item/DAN_1968_183_4_a14/