Realtime graphical display of intonation for speech training. - Dik J. Hermes; Gerard W. G. Spaai; Arent Storm (CHI Posters and Short Talks, 1992)

The Effectiveness of the Intonation Meter for Teaching Intonation to Deaf Persons. - Gerard W. Spaai; Dik J. Hermes; Esther S. Derksen; Paul A. Kaufholz (ICCHP, 1994)