Kaufman, Richard. “Side Lengths of a Right Triangle Reproduced As Perimeters of Other Right Triangles: A Sketch and Proof”. Ohio Journal of School Mathematics 90, no. 1 (May 20, 2022): 44–47. Accessed April 29, 2026. https://www.osu.tests.sfulib4.publicknowledgeproject.org/index.php/OJSM/article/view/8893.