TY - JOUR AU - S. A. Nazarov TI - The asymptotic behaviour of the scattering matrix in a~neighbourhood of the endpoints of a~spectral gap JO - Sbornik. Mathematics PY - 2017 SP - 103 EP - 156 VL - 208 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/SM_2017_208_1_a5/ LA - en ID - SM_2017_208_1_a5 ER -