1. Bahl, L., Jelinek, F., Mercer, R.: A maximum likelihood approach to continuous speech recognition. IEEE Trans. on PAMI-5, 179–190 (1983)
2. Clarkson, P., Rosenfeld, R.: Statistical language modeling using the CMU-cambridge toolkit. In: Proc. Eurospeech, Rhodes, Greece, pp. 2707–2710 (1997)
3. Bonafonte, A., Mariño, J.B.: Language modeling using X-grams. In: Proc. of ICSLP, Philadelphia, PA, pp. 394–397 (1996)
4. Bonafonte, A., Mariño, J.B.: Using X-Gram For Efficient Speech Recognition. In: Proc. of ICSLP, Sydney, Australia (1998)
5. Riccardi, G., Pieraccini, R., Bocchieri, E.: Stochastic automata for language modelling. Computer Speech and Language 10, 265–293 (1996)