@article{TMF_2003_134_3_a9,
     author = {L. I. Danilov},
     title = {The {Spectrum} of the {Two-Dimensional} {Periodic} {Schr\"odinger} {Operator}},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {447--459},
     publisher = {mathdoc},
     volume = {134},
     number = {3},
     year = {2003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2003_134_3_a9/}
}