Das Sarma A, Gajewar A, Lipton R, Nanongkai D. An Approximate Restatement of the Four-Color Theorem. JGAA [Internet]. 2013 Jul. 1 [cited 2024 Jul. 2];17(5):567-73. Available from: http://jgaa-v4.cs.brown.edu/index.php/jgaa/article/view/paper304