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@article{DE_1985_21_1_a9, author = {V. V. Kornienko}, title = {The spectrum of irregular operators}, journal = {Differencialʹnye uravneni\^a}, pages = {65--77}, publisher = {mathdoc}, volume = {21}, number = {1}, year = {1985}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1985_21_1_a9/} }
V. V. Kornienko. The spectrum of irregular operators. Differencialʹnye uravneniâ, Tome 21 (1985) no. 1, pp. 65-77. http://geodesic.mathdoc.fr/item/DE_1985_21_1_a9/