MANDAN, S. R. Uni- and Demi-Orthocentric Simplexes. The Journal of the Indian Mathematical Society, [S. l.], v. 23, n. 3-4, p. 170–184, 1959. DOI: 10.18311/jims/1959/16945. Disponível em: http://www.informaticsjournals.com/index.php/jims/article/view/16945. Acesso em: 19 may. 2024.