1. Absorption characteristics of jute boards with an attached cone at the centre;Mohanan;J. Acoust. Soc. India,1982
2. Sound insulation and room acoustics;Bruel,1951
3. Acoustical designing in architecture;Knudsen,1950
4. ASTM Standard, Impedance and absorption of acoustical materials by impedance tube method, ASTM 1981 Standard C-384-77, p. 146
5. Indian Standard Specification, Method of measurement of absorption coefficient in a reverberation room, IS: 8225-1976