PARRA, R. B. De De; ARIAS, A. F. On the Valiron deficiencies of oriented functions. Mathematica Scandinavica, Berkeley, CA, United States, v. 69, p. 31–44, 1991. DOI: 10.7146/math.scand.a-12367. Disponível em: https://journals.msp.org/mscand/article/view/1306. Acesso em: 25 jul. 2026.