MANDAN, S. R. On Four Intersecting Spheres. The Journal of the Indian Mathematical Society, [S. l.], v. 23, n. 3-4, p. 151–167, 1959. DOI: 10.18311/jims/1959/16944. Disponível em: https://www.informaticsjournals.com/index.php/jims/article/view/16944. Acesso em: 27 apr. 2024.