@article{DA_2009_16_6_a0, author = {O. V. Borodin}, title = {Acyclic 4-coloring of plane graphs without cycles of length~4 and~6}, journal = {Diskretnyj analiz i issledovanie operacij}, pages = {3--11}, publisher = {mathdoc}, volume = {16}, number = {6}, year = {2009}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DA_2009_16_6_a0/} }