Büngener, Aaron, and Michael Kaufmann. “Improving the Crossing Lemma by Characterizing Dense 2-Planar and 3-Planar Graphs”. Journal of Graph Algorithms and Applications 29, no. 3 (August 5, 2026): 143–174. Accessed August 24, 2026. https://jgaa.info/index.php/jgaa/article/view/3000.