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@article{DAN_1976_231_1_a2, author = {O. V. Borodin}, title = {A proof of {Gr\"unbaum's} conjecture on the acyclic $5$-colorability of planar graphs}, journal = {Doklady Akademii Nauk}, pages = {18--20}, publisher = {mathdoc}, volume = {231}, number = {1}, year = {1976}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1976_231_1_a2/} }
O. V. Borodin. A proof of Gr\"unbaum's conjecture on the acyclic $5$-colorability of planar graphs. Doklady Akademii Nauk, Tome 231 (1976) no. 1, pp. 18-20. http://geodesic.mathdoc.fr/item/DAN_1976_231_1_a2/