TY - JOUR AU - I. A. Rudakov TI - Periodic solutions of a non-linear wave equation with homogeneous boundary conditions JO - Izvestiya. Mathematics PY - 2006 SP - 109 EP - 120 VL - 70 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/IM2_2006_70_1_a4/ LA - en ID - IM2_2006_70_1_a4 ER -