References
- Ewertsen H. W. Binaural hørebrille med åbne ørepropper. Nordisk Audiologi 1970; Vol. 6
- Courtois J., Berland O. Ipsi-lateral no-mould fitting of hearing aids. Scand Audiol 1972; 1(No. 4)
- Courtois J. Binaural IROS fitting of hearing aids. Seventh Danavox Symposium. 1975