BIRTEL, Frank T. Slice Algebras of Bounded Analytic Functions. Mathematica Scandinavica, Berkeley, CA, United States, v. 21, p. 54–60, 1967. DOI: 10.7146/math.scand.a-10844. Disponível em: https://journals.msp.org/mscand/article/view/2482. Acesso em: 25 jul. 2026.