TY - JOUR AU - O. V. Borodin TI - Acyclic 4-coloring of plane graphs without cycles of length~4 and~6 JO - Diskretnyj analiz i issledovanie operacij PY - 2009 SP - 3 EP - 11 VL - 16 IS - 6 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DA_2009_16_6_a0/ LA - ru ID - DA_2009_16_6_a0 ER -