Artificial corrections to deaf speech and the development of visual speech training aids. - Ben Maassen; Nico Arends; Dirk-Jan Povel (ECST, 1987)

An evaluation of the Visual Speech Apparatus. - Nico Arends; Dirk-Jan Povel; Edward van Os; Sjef Michielsen; Jef Claassen; Ingrid Feiter (Speech Commun., 1991)

The visual speech apparatus: Theoretical and practical aspects. - Dirk-Jan Povel; Nico Arends (Speech Commun., 1991)