TY - JOUR AU - V. A. Perepelitsa TI - Two problems from graph theory JO - Doklady Akademii Nauk PY - 1970 SP - 1269 EP - 1272 VL - 194 IS - 6 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1970_194_6_a6/ LA - ru ID - DAN_1970_194_6_a6 ER -