TY - JOUR AU - S. A. Nazarov TI - Opening a~gap in the essential spectrum of the elasticity problem in a~periodic semi-layer JO - Algebra i analiz PY - 2009 SP - 166 EP - 204 VL - 21 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/AA_2009_21_2_a6/ LA - ru ID - AA_2009_21_2_a6 ER -