KJELLBERG, Bo. On the Minimum Modulus of Entire Functions of Lower Order Less than One. Mathematica Scandinavica, Berkeley, CA, United States, v. 8, p. 189–197, 1960. DOI: 10.7146/math.scand.a-10608. Disponível em: https://journals.msp.org/mscand/article/view/2735. Acesso em: 25 jul. 2026.