NARANIENGAR, M. T. The Foci of an Inconic. The Journal of the Indian Mathematical Society, [S. l.], v. 3, n. 2, p. 66–71, 1911. DOI: 10.18311/jims/1911/17815. Disponível em: https://informaticsjournals.com/index.php/jims/article/view/17815. Acesso em: 2 may. 2024.