Stupel, Moshe, and Avi Sigler. “Relations Between Various Magnitudes Which Serve As Signs of a Right-Angled Triangle”. Advances in Mathematics and Computer Science Vol. 2 (September 19, 2019): 48-54. Accessed June 12, 2026. https://stm1.bookpi.org/index.php/amacs-v2/article/view/384.