FISHER, Stephen D. Algebras of Continuous Functions Invariant Under the Backward Shift. MATHEMATICA SCANDINAVICA, [S. l.], v. 34, p. 91–100, 1974. DOI: 10.7146/math.scand.a-11509. Disponível em: https://www.mscand.dk/article/view/11509. Acesso em: 15 feb. 2026.