1. Noise conditions in normal school classrooms;Sanders;Exceptional Children,1965
2. Akustiska miljön i våra skolor;Ingberg;Audio Nytt,1974
3. Speech levels and speech-to-noise ratios;Markides;Br. J. Audiol.,1986
4. Problems of noise in school settings: A review of literature and the results of an exploratory study;Hétu;J. Speech Language Pathol. and Audiol.,1990
5. Acoustic conditions for speech communication in classrooms;Pekkarinen;Scand. Audiol.,1991