@article{SM_2017_208_1_a5,
     author = {S. A. Nazarov},
     title = {The asymptotic behaviour of the scattering matrix in a~neighbourhood of the endpoints of a~spectral gap},
     journal = {Sbornik. Mathematics},
     pages = {103--156},
     publisher = {mathdoc},
     volume = {208},
     number = {1},
     year = {2017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2017_208_1_a5/}
}