M. H., Oryan. On power series and Mahler’s U-numbers. Mathematica Scandinavica, Berkeley, CA, United States, v. 65, p. 143–151, 1989. DOI: 10.7146/math.scand.a-12273. Disponível em: https://journals.msp.org/mscand/article/view/1375. Acesso em: 24 jul. 2026.