1. Sound Absorbing Materials;Zwikker,1949
2. Mechanical Vibration;den Hartog,1956
3. The damping of eigen-tones in small rooms by Helmholtz resonators;van Leeuwen;European Broadcasting Union Review, A—Technical,1960
4. Computational analysis of coupled resonators;Britz;Journal of Sound and Vibration,1978
5. Vibration and Sound;Morse,1948