Publivox: a voice controlled card pay phone. - Christian Gagnoulet; F. Zurcher; J. Tirbois; T. Serradura (ECST, 1987)

A robust and fast celp coder at 16 kbit/s. - Alain Le Guyader; Dominique Massaloux; F. Zurcher (Speech Commun., 1988)