1. On the design of perforated facings for acoustical materials;Bolt;Journal of the Acoustical Society of America,1947
2. Absorption characteristics of acoustical material with perforated facings;Ingard;Journal of the Acoustical Society of America,1951
3. The use of perforated facings in designing low frequency resonant absorbers;Callaway;Journal of the Acoustical Society of America,1952
4. Design calculations of sound absorbers comprising a porous material with a perforated facing;Vehizhanina;Soviet Physics—Acoustics (English Transl.),1968
5. Sound absorbing materials;Zwikker,1949