1. Final Report“, ESPRIT Project 5192, SPELL, ed. by J.P. Lefèvre, November 1992.
2. Lefèvre J.P., Hiller S.M., Rooney E., Laver J., Di Benedetto M.G., “Macro and Micro Features for Automated Pronunciation Improvement in the SPELL System”, Speech Communication, Vol. 11, N° 1, pp. 31–44, March 1992.
3. Rooney E., Hiller S.M., Laver J., Jack M., “Prosodic Features for Automated Pronunciation Improvement in the SPELL System”, Proc. ICSLP 92, Banff, Alberta, Canada, pp. 413–416, October 1992.
4. Di Benedetto M.G., Carraro F., Hiller S.M., Rooney E., “Vowels Pronunciation Assessment in the SPELL System”, Proc. ICSLP 92, Banff, Alberta, Canada, pp. 417–420, October 1992.
5. Medan Y., Yair E., Chazan D., “Super Resolution Pitch Determination of Speech Signals”, IEEE Trans. on Signal Processing, Vol. ASSP-39, N° 1, pp. 40–48, January 1991.