KJELLBERG, B. A Theorem on the Minimum Modulus of Entire Functions. MATHEMATICA SCANDINAVICA, [S. l.], v. 12, p. 5–11, 1963. DOI: 10.7146/math.scand.a-10666. Disponível em: https://www.mscand.dk/article/view/10666. Acesso em: 1 jul. 2022.