TY - JOUR AU - A. A. Uspenskii TI - Necessary conditions for the existence of pseudovertices of the boundary set in the Dirichlet problem for the eikonal equation JO - Trudy Instituta matematiki i mehaniki PY - 2015 SP - 250 EP - 263 VL - 21 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/TIMM_2015_21_1_a25/ LA - ru ID - TIMM_2015_21_1_a25 ER -