NARAYANAN, S. Conic-Pairs in a Certain Relation. The Journal of the Indian Mathematical Society, [S. l.], v. 9, n. 3, p. 104–108, 1917. DOI: 10.18311/jims/1917/17606. Disponível em: http://informaticsjournals.com/index.php/jims/article/view/17606. Acesso em: 7 may. 2024.