TORNEHAVE, Hans. On Entire Functions Almost Periodic in Several Directions. Mathematica Scandinavica, Berkeley, CA, United States, v. 16, p. 116–120, 1965. DOI: 10.7146/math.scand.a-10752. Disponível em: https://journals.msp.org/mscand/article/view/2578. Acesso em: 25 jul. 2026.