Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1967_3_3_a12, author = {M. M. Gekhtman and A. G. Kostyuchenko}, title = {Complex eigenvalues of a non-selfadjoint operator}, journal = {Differencialʹnye uravneni\^a}, pages = {509--513}, publisher = {mathdoc}, volume = {3}, number = {3}, year = {1967}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1967_3_3_a12/} }
M. M. Gekhtman; A. G. Kostyuchenko. Complex eigenvalues of a non-selfadjoint operator. Differencialʹnye uravneniâ, Tome 3 (1967) no. 3, pp. 509-513. http://geodesic.mathdoc.fr/item/DE_1967_3_3_a12/