J. Durand, P. Gonçalvès, and Y. Guédon, Computational Methods for Hidden Markov Tree Models???An Application to Wavelet Trees, IEEE Transactions on Signal Processing, vol.52, issue.9, pp.2551-2560, 2004.
DOI : 10.1109/TSP.2004.832006
URL : https://hal.archives-ouvertes.fr/hal-00830078

J. Durand and Y. Guédon, Localizing the latent structure canonical uncertainty: entropy profiles for hidden Markov models, Statistics and Computing, vol.248, issue.3, 2012.
DOI : 10.1007/s11222-014-9494-9
URL : https://hal.archives-ouvertes.fr/hal-00675223

Y. Ephraim and N. Merhav, Hidden Markov processes, IEEE Transactions on Information Theory, vol.48, issue.6, pp.1518-1569, 2002.
DOI : 10.1109/TIT.2002.1003838

D. Hernando, V. Crespi, C. , and G. , Efficient Computation of the Hidden Markov Model Entropy for a Given Observation Sequence, IEEE Transactions on Information Theory, vol.51, issue.7, pp.2681-2685, 2005.
DOI : 10.1109/TIT.2005.850223