隠れマルコフモデル
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↑ Baum, L. E.; Petrie, T.; Soules, G.; Weiss, N. (1970). “A Maximization Technique Occurring in the Statistical Analysis of Probabilistic Functions of Markov Chains”. The Annals of Mathematical Statistics 41 (1): 164–171. doi:10.1214/aoms/1177697196. JSTOR 2239727. MR287613. Zbl 0188.49603.
↑ Baum, L.E. (1972). “An Inequality and Associated Maximization Technique in Statistical Estimation of Probabilistic Functions of a Markov Process”. Inequalities 3: 1–8.