DALAL, S. S. On the Zeros of an Entire Function III. Mathematica Scandinavica, Berkeley, CA, United States, v. 22, p. 108–114, 1968. DOI: 10.7146/math.scand.a-10875. Disponível em: https://journals.msp.org/mscand/article/view/2426. Acesso em: 25 jul. 2026.