TY - JOUR AU - A. A. Makhnev TI - Graphs in which neighborhoods of vertices are isomorphic to the Hoffman--Singleton graph JO - Trudy Instituta matematiki i mehaniki PY - 2009 SP - 143 EP - 161 VL - 15 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/TIMM_2009_15_2_a13/ LA - ru ID - TIMM_2009_15_2_a13 ER -