NOBRE, Sergio Roberto. Editorial - UBIRATAN D’AMBROSIO (1932–2021) – IN MEMORIAM. Brazilian Journal on the History of Mathematics, [s. l.], vol. 21, no. 41, p. 01–10, 2021. DOI: 10.47976/RBHM2021v20n4101-10. Disponível em: http://rbhm.org.br/index.php/RBHM/article/view/339. Acesso em: 19 may. 2024.