TORNEHAVE, H. On Entire Functions Almost Periodic in Several Directions. MATHEMATICA SCANDINAVICA, [S. l.], v. 16, p. 116–120, 1965. DOI: 10.7146/math.scand.a-10752. Disponível em: https://www.mscand.dk/article/view/10752. Acesso em: 7 may. 2024.