BOREHARDT, W. G.; PERROT, A. D. Geometry for Schools. The Journal of the Indian Mathematical Society, [S. l.], v. 5, n. 6, p. 215–215, 1913. DOI: 10.18311/jims/1913/17720. Disponível em: http://informaticsjournals.com/index.php/jims/article/view/17720. Acesso em: 9 may. 2024.