TORNEHAVE, H. On Entire Functions Almost Periodic in Two Directions. MATHEMATICA SCANDINAVICA, [S. l.], v. 6, p. 160–174, 1958. DOI: 10.7146/math.scand.a-10540. Disponível em: https://www.mscand.dk/article/view/10540. Acesso em: 11 apr. 2025.