1. Aitchison, J., Silvey, S.D.: Maximum-likelihood estimation of parameters subject to restraints. Ann. Math. Stats. 29, 813?828 (1958)
2. Billingsley, P.:Statistical inference for Markov processes. Chicago: University of Chicago Press 1961
3. Howard, R.A.: Dynamic programming and Markov processes. New York: Technology Press & J. Wiley 1960
4. Mandl, P.: On the variance in controlled Markov chains. Kybernetika (Prague) 7, 1?12 (1971)
5. Mandl, P.: On the control of a Markov chain in the presence of unknown parameters. Transactions of the Sixth Prague Conference on Information Theory etc. pp. 601?612. Prague: Academia 1973