1. Barr, B.: Pure tone audiometry for pre-school children. Acta Otolaryng., Suppl. 121, 1955.
2. Binaural hearing aids for young children;Bender;Volta Rev.,1960
3. Sound Pressure Generated in the Human External Ear by a Free Field Sound;Berland,1968
4. Effects of hearing aid on deaf speech;Briskey,1967
5. The usefulness of the binaural hearing aid;Carhart;J. Speech Hearing Dis.,1958