Bannister, Michael, Sergio Cabello, and David Eppstein. “Parameterized Complexity of 1-Planarity”. Journal of Graph Algorithms and Applications 22, no. 1 (January 1, 2018): 23–49. Accessed March 28, 2026. https://jgaa-v5.cs.brown.edu/index.php/jgaa/article/view/paper457.