1. Sound Waves in Rooms;Morse;Rev Mod Phys,1944
2. Bauphysikalische Entwurfslehre - Teil: 4;Fasold,1976
3. Acoustic absorbers and diffusers: theory, design and application;Cox,2004
4. On the design of perforated facings for acoustic materials;Bolt;J Acoust Soc Am,1947
5. Sound Absorbing Materials;Zwikker,1949