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3. IEC Standards, 60268-16:1998 (also BS EN 60268-16 and BS 60268-16), Sound system equipment, Part 16: Objective Rating of Speech Intelligibility by Speech Transmission Index, 1998.
4. A comparison of three classical concert halls;Bradley;J. Acoust. Soc. Am.,1991
5. Acoustical Design of Concert Halls and Theatres;Jordon,1980