@article{SM_2010_201_4_a3,
     author = {S. A. Nazarov},
     title = {An example of multiple gaps in the spectrum of a~periodic waveguide},
     journal = {Sbornik. Mathematics},
     pages = {569--594},
     publisher = {mathdoc},
     volume = {201},
     number = {4},
     year = {2010},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2010_201_4_a3/}
}