1. Baum, L. E. (1972), An Inequality and Associated Maximization Technique in Statistical Estimation for Probabilistic Functions of Markov Processes, Inequalities 3, 1-8.
2. Baum, L. E. and Egon, J. A. (1967), An Inequality with Applications to Statistical Estimation for Probabilistic Functions of a Markov Process and to a Model for Ecology, Bull. Am. Meteorol. Soc. 73, 360-363.
3. Baum, L. E. and Petric, T. (1966), Statistical Inference for Probabilistic Functions of Finite State Markov Chains, Ann. Math. Stat. 37, 1554-1563.
4. Baum, L. E. Pe-Erie, T., Soules, G., and Weiss, H. (1970), A Maximization Technique Occurring in the Statistical Analysis of Probabilistic Functions of Markov Chains, Ann. Math. Soc. 41, 164-171.
5. Baum, L. E. and Sell, G. R. (1968), Growth Functions for Transformations on Manifolds, Pac. J. Math. 27, 211-227.