FISHER, Stephen D. Algebras of Continuous Functions Invariant Under the Backward Shift. Mathematica Scandinavica, Berkeley, CA, United States, v. 34, p. 91–100, 1974. DOI: 10.7146/math.scand.a-11509. Disponível em: https://journals.msp.org/mscand/article/view/2135. Acesso em: 25 jul. 2026.