@article{MZM_2010_87_5_a9,
     author = {S. A. Nazarov},
     title = {Opening of a {Gap} in the {Continuous} {Spectrum} of a {Periodically} {Perturbed} {Waveguide}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {764--786},
     publisher = {mathdoc},
     volume = {87},
     number = {5},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2010_87_5_a9/}
}