BATES, Teresa; CARLSEN, Toke Meier; EILERS, Søren. Dimension groups associated to $\beta$-expansions. Mathematica Scandinavica, Berkeley, CA, United States, v. 100, n. 2, p. 198–208, 2007. DOI: 10.7146/math.scand.a-15022. Disponível em: https://journals.msp.org/mscand/article/view/675. Acesso em: 24 jul. 2026.