References
- “Resonant absorbers and reverberation”, First summer symposium of the Acoustics Group, 1947.
- Smits, J. M. A. & Kosten, O. W., “Sound absorption by slit resonators”, Acoustica, 1, 3, 115.
- Ingerslev, Acoustics in Modern Building Practice.
- Idem, Ibid., p. 147.