Sharp, B., K. Perkins, T. Keracher, and L. Lehman. “Beware of the Parallel-Replacement Zombies”. Ohio Journal of School Mathematics, vol. 90, no. 1, Mar. 2022, p. 23-27, https://www.osu.tests.sfulib4.publicknowledgeproject.org/index.php/OJSM/article/view/8715.