1. Sound Absorbing Materials;Zwikker,1949
2. Acoustic properties of flexible and porous materials;Kosten;Acustica,1957
3. Acoustical properties of homogeneous, isotropic rigid tiles and flexible blankets;Beranek;Journal of the Acoustical Society of America,1947
4. Acoustic propagation in granular media;Morse;Journal of the Acoustical Society of America,1952
5. Sound propagation in a fibre block as a composite medium;Kawasima;Acustica,1960