1. Transmission of reverberant sound through double walls;London;J. Acoust. Soc. Am.,1950
2. On the propagation of airborne sounds through solid walls and walls with air spaces;Cammerer;Gesundheits Ing.,1934
3. Sound Insulation and Room Acoustics;Bruel,1951
4. M.Sc. Dissertation;Cummings,1966