@conference{keele2000the, title = {The Application of Broadband Constant Beamwidth Transducer (CBT) Theory to Loudspeaker Arrays}, author = {Keele, Jr., D. B. (Don)}, booktitle = {Audio Engineering Society Convention 109}, month = {Sep}, year = {2000}, url = {https://www.aes.org/e-lib/browse.cfm?elib=9122} }