FARSI, Carla; WATLING, Neil. Trivial fixed point subalgebras of the rotation algebra. Mathematica Scandinavica, Berkeley, CA, United States, v. 72, p. 298–302, 1993. DOI: 10.7146/math.scand.a-12449. Disponível em: https://journals.msp.org/mscand/article/view/1178. Acesso em: 25 jul. 2026.