@article{DE_1991_27_7_a15,
     author = {N. Yu. Orlov},
     title = {A variational approach to the determination of the energy spectrum of bound electrons},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1237--1245},
     publisher = {mathdoc},
     volume = {27},
     number = {7},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1991_27_7_a15/}
}