1. On the transmission of sound through small àpertures and narrow slits;Ingerslev,1944
2. On the transmission of acoustic waves through a circular channel in a thick wall;Normura;Science Report Tohuku University,1960
3. The sound transmission loss of circular and slit-shaped apertures in walls;Gomperts;Acustica,1967
4. Sound transmission through rectangular slots of finite depth between reverberant rooms;Sauter;Journal of the Acoustical Society of America,1970
5. Transmission of sound through apertures of negligible thickness;Mulholland;Journal of Sound and Vibration,1967