1. B. D. O. Anderson and J. B. Moore. Optimal Filtering. Prentice-Hall, Englewood Cliffs, NJ, 1979.
2. P. Baldi, Y. Chauvin, T. Hunkapiller, and M.A. McClure. Hidden Markov models of biological primary sequence information. Proc. Nat. Acad. Sci. (USA), 91(3):1059–1063, 1994.
3. L.E. Baum, T. Petrie, G. Soules, and N. Weiss. A maximization technique occurring in the statistical analysis of probabilistic functions of Markov chains. The Annals of Mathematical Statistics, 41:164–171, 1970.
4. Y. Bengio and P. Frasconi. An input-output HMM architecture. In G. Tesauro, D. S. Touretzky, and T. K. Leen, editors, Advances in Neural Information Processing Systems 7, pages 427–434. MIT Press, Cambridge, MA, 1995.
5. J. Besag. Spatial interaction and the statistical analysis of lattice systems. J. Royal Stat. Soc. B, 36:192–326, 1974.