CONF BerthoGlotin99:MSPRijcai/IDIAP A measure of speech and pitch reliability from voicing Berthommier, Frédéric Glotin, Hervé Klassner, F. Ed. Proc. Int. Joint Conf. on Artificial Intelligence (IJCAI) Computational Auditory Scene Analysis (CASA) workshop 1999 Scandinavian AI Society Stockholm July 1999 61-70