@article{1077310237, author = {Mitchem, John}, title = {Every planar graph has an acyclic $8$ -coloring}, journal = {Duke Math. J.}, volume = {41}, number = {1}, year = {1974}, pages = { 177-181}, language = {en}, url = {http://dml.mathdoc.fr/item/1077310237} }
Mitchem, John. Every planar graph has an acyclic $8$ -coloring. Duke Math. J., Tome 41 (1974) no. 1, pp. 177-181. http://gdmltest.u-ga.fr/item/1077310237/