@article{DE_1991_27_6_a15,
     author = {M. B. Muratbekov},
     title = {Separability and estimates for the widths of sets connected with the domain of a nonlinear operator of {Schr\"odinger} type},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1034--1042},
     publisher = {mathdoc},
     volume = {27},
     number = {6},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1991_27_6_a15/}
}