Laird, Taryn, and Jose Martinez. “The Longest Branch of the Tree of Irreducible Numerical Semigroups With Odd Frobenius Number”. Minnesota Journal of Undergraduate Mathematics 2, no. 1 (November 16, 2016). Accessed May 18, 2024. https://pubs.lib.umn.edu/index.php/mjum/article/view/4123.