MANDAN, S. R. Uni- and Demi-Orthocentric Simplexes, II. The Journal of the Indian Mathematical Society, [S. l.], v. 26, n. 1-2, p. 5–11, 1962. DOI: 10.18311/jims/1962/16874. Disponível em: https://www.informaticsjournals.com/index.php/jims/article/view/16874. Acesso em: 2 may. 2024.