KJELLBERG, Bo. A Theorem on the Minimum Modulus of Entire Functions. Mathematica Scandinavica, Berkeley, CA, United States, v. 12, p. 5–11, 1963. DOI: 10.7146/math.scand.a-10666. Disponível em: https://journals.msp.org/mscand/article/view/2654. Acesso em: 25 jul. 2026.