HOFFMANN-JORGENSEN, J. Markov Sets. Mathematica Scandinavica, Berkeley, CA, United States, v. 24, p. 145–166, 1969. DOI: 10.7146/math.scand.a-10927. Disponível em: https://journals.msp.org/mscand/article/view/2371. Acesso em: 25 jul. 2026.