GROVE, Karsten. Involution-invariant geodesics. Mathematica Scandinavica, Berkeley, CA, United States, v. 36, p. 97–108, 1975. DOI: 10.7146/math.scand.a-11565. Disponível em: https://journals.msp.org/mscand/article/view/2052. Acesso em: 25 jul. 2026.