Cavalcanti, Lialda B., and Cristiane de Arimatéa Roch. “Proofs and Generalizations of the Pythagorean Theorem”. Praxis & Saber, vol. 2, no. 3, Jan. 2011, pp. 103-18, https://revistas.uptc.edu.co/index.php/praxis_saber/article/view/1112.