HOFFMANN-JORGENSEN, J. Markov Sets. MATHEMATICA SCANDINAVICA, [S. l.], v. 24, p. 145–166, 1969. DOI: 10.7146/math.scand.a-10927. Disponível em: https://www.mscand.dk/article/view/10927. Acesso em: 2 may. 2024.