FARSI, C.; WATLING, N. Trivial fixed point subalgebras of the rotation algebra. MATHEMATICA SCANDINAVICA, [S. l.], v. 72, p. 298–302, 1993. DOI: 10.7146/math.scand.a-12449. Disponível em: https://www.mscand.dk/article/view/12449. Acesso em: 5 may. 2024.