Akiyama, Jin, Sin Hitotumatu, and Ikuro Sato. “A NOTE ON THE EXISTENCE OF A UNIVERSAL POLYTOPE AMONG REGULAR 4-POLYTOPES”. Journal of the Indonesian Mathematical Society 19, no. 1 (May 30, 2013): 41–47. Accessed May 8, 2024. https://jims-a.org/index.php/jimsa/article/view/128.