D. RAMPRASAD. Pythagorean triangles and addition of nonagonal, triangular numbers. Malaya Journal of Matematik, India, v. 9, n. 01, p. 639–640, 2021. Disponível em: https://www.malayajournal.org/index.php/mjm/article/view/1101. Acesso em: 22 nov. 2024.