S. Martinez et Me. Vares, A MARKOV-CHAIN ASSOCIATED WITH THE MINIMAL QUASI-STATIONARY DISTRIBUTION OF BIRTH-DEATH CHAINS, Journal of Applied Probability, 32(1), 1995, pp. 25-38
We show that if the limiting conditional distribution for an absorbed
birth-death chain exists, then the chain conditioned to non-absorption
converges to a Markov chain with transition probabilities given by th
e matrix associated with the minimal quasi-stationary distribution.