@article{MZM_2003_73_1_a4,
     author = {L. I. Danilov},
     title = {Absolute {Continuity} of the {Spectrum} of a {Periodic} {Schr\"odinger} {Operator}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {49--62},
     publisher = {mathdoc},
     volume = {73},
     number = {1},
     year = {2003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2003_73_1_a4/}
}