Myrvold, Wendy, and Jennifer Woodcock. “A Large Set of Torus Obstructions and How They Were Discovered”. The Electronic Journal of Combinatorics 25, no. 1 (January 25, 2018): #P1.16. Accessed May 29, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v25i1p16.