@article{MZM_1992_52_2_a15,
     author = {Yu. P. Chuburin},
     title = {On the {Schr\"odinger} operator with a small potential in the case of a crystal film},
     journal = {Matemati\v{c}eskie zametki},
     pages = {138--143},
     publisher = {mathdoc},
     volume = {52},
     number = {2},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1992_52_2_a15/}
}