@article{DE_1991_27_4_a3,
     author = {V. A. Il'in},
     title = {Equiconvergence, with a trigonometric series, of expansions in root functions of the one-dimensional {Schr\"odinger} operator with complex potential in the class $L_1$},
     journal = {Differencialʹnye uravneni\^a},
     pages = {577--597},
     publisher = {mathdoc},
     volume = {27},
     number = {4},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1991_27_4_a3/}
}