De Luca, Felice, Emilio Di Giacomo, Seok-Hee Hong, Stephen Kobourov, William Lenhart, Giuseppe Liotta, Henk Meijer, Alessandra Tappini, and Stephen Wismath. “Packing Trees into 1-Planar Graphs”. Journal of Graph Algorithms and Applications 25, no. 2 (November 1, 2021): 605–624. Accessed June 16, 2025. https://jgaa-v4.cs.brown.edu/index.php/jgaa/article/view/paper574.