NAKANIENGAR, M. T. The Harmonic Centre. The Journal of the Indian Mathematical Society, [S. l.], v. 5, n. 1, p. 14–15, 1913. DOI: 10.18311/jims/1913/17742. Disponível em: https://informaticsjournals.com/index.php/jims/article/view/17742. Acesso em: 28 apr. 2024.