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@article{DE_1972_8_7_a7, author = {R. A. Shirikyan}, title = {The spectrum of nonselfadjoint ordinary differential operators of higher order}, journal = {Differencialʹnye uravneni\^a}, pages = {1214--1224}, publisher = {mathdoc}, volume = {8}, number = {7}, year = {1972}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1972_8_7_a7/} }
R. A. Shirikyan. The spectrum of nonselfadjoint ordinary differential operators of higher order. Differencialʹnye uravneniâ, Tome 8 (1972) no. 7, pp. 1214-1224. http://geodesic.mathdoc.fr/item/DE_1972_8_7_a7/