Gagarin, Andrei, William Kocay, and Daniel Neilson. “Embeddings of Small Graphs on the Torus”. CUBO, A Mathematical Journal 5, no. 2 (June 1, 2003): 351–371. Accessed May 19, 2024. https://cubo.ufro.cl/ojs/index.php/cubo/article/view/1703.