1. Speech reinforcement in St. Paul's Cathedral—experimental system using line-source loudspeakers and time delays;Parkin;Wireless World,1952
2. Speech reinforcement in St. Paul's Cathedral—details of the equipment and results of tests;Parkin;Wireless World,1952
3. Measurement of reverberation time in auditoria;International Standards Organization;ISO-3382,1975
4. New method of measuring reverberation time;Schroeder;Journal of the Acoustical Society of America,1965
5. Acoustic Measurements;Beranek,1949