KJELLBERG, B. On the Minimum Modulus of Entire Functions of Lower Order Less than One. MATHEMATICA SCANDINAVICA, [S. l.], v. 8, p. 189–197, 1960. DOI: 10.7146/math.scand.a-10608. Disponível em: https://www.mscand.dk/article/view/10608. Acesso em: 3 may. 2024.