Petter er ikke dum
– han kan bare ikke høre hva læreren sier.
| 1) | “Speech Intelligibility in Classrooms”, forskningsprosjekt ved Department of Building Engineering & Surveying på Herriot-Watt University i Edinburgh |
| 2) | Danish National Research Center for Working Environment: “Noise from human activity” |
| 3) | Julian Treasure, Sound Business, 2007 |
| 4) | Kilde: Health Technical Memorandum 08-01: Acoustics |
