Morgan, Kerri, and Graham Farr. “Approximation Algorithms for the Maximum Induced Planar and Outerplanar Subgraph Problems”. Journal of Graph Algorithms and Applications 11, no. 1 (January 1, 2007): 165–193. Accessed December 22, 2024. https://jgaa.info/index.php/jgaa/article/view/paper141.