NUMMELIN, E. The convergence of sums of transition probabilities of a positive recurrent Markov chain. Mathematica Scandinavica, Berkeley, CA, United States, v. 48, p. 79–95, 1981. DOI: 10.7146/math.scand.a-11901. Disponível em: https://journals.msp.org/mscand/article/view/1727. Acesso em: 25 jul. 2026.