NARANIENGAR, M. T. The Harmonic Centre. The Journal of the Indian Mathematical Society, [S. l.], v. 4, n. 3, p. 96–98, 1912. DOI: 10.18311/jims/1912/17758. Disponível em: https://informaticsjournals.com/index.php/jims/article/view/17758. Acesso em: 3 may. 2024.