1. Rahul, M., Kohli, N., Agrawal, R.: Facial expression recognition using hidden Markov model: a review. In: National Conference on RAICT, HBTU, Kanpur, March 25–26 (2017). ISBN: 978-93-86256-82-9
2. Katagiri, S., Lee, C.-H.: A new hybrid algorithm for speech recognition based on HMM segmentation and learning vector quantization. IEEE Trans. Speech Audio Process. 1(4), 421–430 (1993)
3. Tsapatsoulis, N., Leonidou, M., Kollias, S.: Facial expression recognition using HMM with observation dependent transition matrix. In: 1998 IEEE Second Workshop on Multimedia Signal Processing, pp. 89–95, 7–9 Dec 1998
4. Rabiner, L.R.: A tutorial on hidden Markov models and selected applications in speech recognition. Proc. IEEE 77(2), 257–286 (1989)
5. Atlas. L., Ostendorf, M., Bernard, G.D.: Hidden Markov models for monitoring, machining tool-wear. In: IEEE International Conference on Acoustics, Speech, and Signal Processing, vol. 6, pp. 3887–3890 (2000)