@article{TMF_2004_140_2_a7,
     author = {M. S. Smetanina and Yu. P. Chuburin},
     title = {Schr\"odinger {Operator} {Levels} for a {Crystal} {Film} with {a~Nonlocal} {Potential}},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {297--302},
     publisher = {mathdoc},
     volume = {140},
     number = {2},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2004_140_2_a7/}
}