BIRTEL, Frank T. Slice Algebras of Bounded Analytic Functions. MATHEMATICA SCANDINAVICA, [S. l.], v. 21, p. 54–60, 1967. DOI: 10.7146/math.scand.a-10844. Disponível em: https://tidsskrift.dk/math/article/view/10844. Acesso em: 14 aug. 2026.