@article{ZVMMF_2009_49_2_a11,
     author = {S. A. Nazarov},
     title = {Gap detection in the spectrum of an elastic periodic waveguide with a~free surface},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {332--343},
     publisher = {mathdoc},
     volume = {49},
     number = {2},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_2009_49_2_a11/}
}