TY - JOUR AU - S. A. Nazarov TI - Gap opening around a given point of the spectrum of a cylindrical waveguide by means of gentle periodic perturbation of walls JO - Zapiski Nauchnykh Seminarov POMI PY - 2014 SP - 90 EP - 130 VL - 422 UR - http://geodesic.mathdoc.fr/item/ZNSL_2014_422_a5/ LA - ru ID - ZNSL_2014_422_a5 ER -