Borradaile, Glencora, David Eppstein, and Pingan Zhu. “Planar Induced Subgraphs of Sparse Graphs”. Journal of Graph Algorithms and Applications 19, no. 1 (January 1, 2015): 281–297. Accessed July 6, 2024. http://jgaa-v4.cs.brown.edu/index.php/jgaa/article/view/paper358.