GRAVERSEN, S. E.; RAO, M. On strong Markov duals. MATHEMATICA SCANDINAVICA, [S. l.], v. 49, p. 275–282, 1981. DOI: 10.7146/math.scand.a-11936. Disponível em: https://www.mscand.dk/article/view/11936. Acesso em: 22 nov. 2024.