WILKINSON, A. C. L. On the Nine Point Circle. The Journal of the Indian Mathematical Society, [S. l.], v. 9, n. 2, p. 55–73, 1917. DOI: 10.18311/jims/1917/17600. Disponível em: https://www.informaticsjournals.com/index.php/jims/article/view/17600. Acesso em: 5 may. 2024.