RICE, P. M. Circular Flows on $S^3$. Mathematica Scandinavica, Berkeley, CA, United States, v. 21, p. 128–135, 1967. DOI: 10.7146/math.scand.a-10852. Disponível em: https://journals.msp.org/mscand/article/view/2473. Acesso em: 25 jul. 2026.