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@article{DE_1991_27_1_a17, author = {R. R. Ashurov}, title = {Bi-orthogonal expansions of a nonselfadjoint {Schr\"odinger} operator}, journal = {Differencialʹnye uravneni\^a}, pages = {156--158}, publisher = {mathdoc}, volume = {27}, number = {1}, year = {1991}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1991_27_1_a17/} }
R. R. Ashurov. Bi-orthogonal expansions of a nonselfadjoint Schr\"odinger operator. Differencialʹnye uravneniâ, Tome 27 (1991) no. 1, pp. 156-158. http://geodesic.mathdoc.fr/item/DE_1991_27_1_a17/