GALLATLY, W. In-Conics. The Journal of the Indian Mathematical Society, [S. l.], v. 3, n. 4, p. 150–151, 1911. DOI: 10.18311/jims/1911/17805. Disponível em: https://www.informaticsjournals.com/index.php/jims/article/view/17805. Acesso em: 29 apr. 2024.