1. ISO standard 354. Measurement of sound absorption in a reverberation room, International Organization for Standardization, Geneva, Switzerland.
2. ISO standard 11654 Sound absorbers for use in buildings - Rating of sound absorption, international Organization for Standardization, Geneva, Switzerland.
3. S.-I. Thomasson, Theory and experiment on the sound absorption as function of the area, Tech. Rep. No. TRITA-TAK 8201, KTH, Stockholm, Sweden, 1982.
4. Absorption and radiation impedance of finite absorbing patches;Holmberg;Acta Acust. Acust.,2003
5. A correction of random incidence absorption coefficients for the angular distribution of acoustic energy under measurement conditions;Jeong;J. Acoust. Soc. Am.,2009