%0 Journal Article %1 appel1977 %A Appel, K. %A Haken, W. %D 1977 %I University of Illinois at Urbana-Champaign, Department of Mathematics %J Illinois J. Math. %K four.color.theorem graph.theory %N 3 %P 429--490 %T Every planar map is four colorable. Part I: Discharging %U http://projecteuclid.org/euclid.ijm/1256049011 %V 21

@article{appel1977, added-at = {2015-05-19T09:34:53.000+0200}, author = {Appel, K. and Haken, W.}, biburl = {https://www.bibsonomy.org/bibtex/2f84d4de966f07c465b597a96d61c6ac2/ytyoun}, fjournal = {Illinois Journal of Mathematics}, interhash = {6e6d9a2ed20303438b33405a95542cdb}, intrahash = {f84d4de966f07c465b597a96d61c6ac2}, journal = {Illinois J. Math.}, keywords = {four.color.theorem graph.theory}, month = {09}, number = 3, pages = {429--490}, publisher = {University of Illinois at Urbana-Champaign, Department of Mathematics}, timestamp = {2015-05-19T09:36:41.000+0200}, title = {Every planar map is four colorable. Part I: Discharging}, url = {http://projecteuclid.org/euclid.ijm/1256049011}, volume = 21, year = 1977 }