GROVE, K. Involution-invariant geodesics. MATHEMATICA SCANDINAVICA, [S. l.], v. 36, p. 97–108, 1975. DOI: 10.7146/math.scand.a-11565. Disponível em: https://www.mscand.dk/article/view/11565. Acesso em: 3 may. 2024.