CHANG, John; SARIO, Leo. Royden’s Algebra on Riemannian Spaces. Mathematica Scandinavica, Berkeley, CA, United States, v. 28, p. 139–158, 1971. DOI: 10.7146/math.scand.a-11012. Disponível em: https://journals.msp.org/mscand/article/view/2285. Acesso em: 25 jul. 2026.