ESSÉN, Matts. A Theorem on the Maximum Modulus of Entire Functions. Mathematica Scandinavica, Berkeley, CA, United States, v. 17, p. 161–168, 1965. DOI: 10.7146/math.scand.a-10770. Disponível em: https://journals.msp.org/mscand/article/view/2555. Acesso em: 25 jul. 2026.