HELGASON, S. Some Remarks on the Exponential Mapping for an Affine Connection. MATHEMATICA SCANDINAVICA, [S. l.], v. 9, p. 129–146, 1961. DOI: 10.7146/math.scand.a-10631. Disponível em: https://www.mscand.dk/article/view/10631. Acesso em: 28 apr. 2024.