HANCL, Jaroslav; STEPNICKA, Jan. A note on irrationality measures. Mathematica Scandinavica, Berkeley, CA, United States, v. 104, n. 1, p. 117–123, 2009. DOI: 10.7146/math.scand.a-15088. Disponível em: https://journals.msp.org/mscand/article/view/609. Acesso em: 24 jul. 2026.