CHANG, J.; SARIO, L. Royden’s Algebra on Riemannian Spaces. MATHEMATICA SCANDINAVICA, [S. l.], v. 28, p. 139–158, 1971. DOI: 10.7146/math.scand.a-11012. Disponível em: https://www.mscand.dk/article/view/11012. Acesso em: 5 may. 2024.