@article{MZM_1997_62_5_a13,
     author = {Yu. P. Chuburin},
     title = {On approximation of the {{\textquotedblleft}Membrane{\textquotedblright}} {Schr\"odinger} operator by the {{\textquotedblleft}Crystal{\textquotedblright}} operator},
     journal = {Matemati\v{c}eskie zametki},
     pages = {773--781},
     year = {1997},
     volume = {62},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1997_62_5_a13/}
}