@article{SM_2012_203_2_a0,
     author = {G. Cardone and S. A. Nazarov and K. Ruotsalainen},
     title = {Asymptotic behaviour of an eigenvalue in the continuous spectrum of a~narrowed waveguide},
     journal = {Sbornik. Mathematics},
     pages = {153--182},
     publisher = {mathdoc},
     volume = {203},
     number = {2},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2012_203_2_a0/}
}