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@article{DE_1971_7_1_a14, author = {M. V. Fokin}, title = {The spectrum of a certain operator}, journal = {Differencialʹnye uravneni\^a}, pages = {135--141}, publisher = {mathdoc}, volume = {7}, number = {1}, year = {1971}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1971_7_1_a14/} }
M. V. Fokin. The spectrum of a certain operator. Differencialʹnye uravneniâ, Tome 7 (1971) no. 1, pp. 135-141. http://geodesic.mathdoc.fr/item/DE_1971_7_1_a14/