@conference{willett1998the, title = {The Symmetrical Microphone Capsule and The Quest for the Perfect -Acoustic Window-}, author = {Willett, John}, booktitle = {Audio Engineering Society Conference: UK 13th Conference: Microphones & Loudspeakers}, month = {Mar}, year = {1998}, url = {https://www.aes.org/e-lib/browse.cfm?elib=8001} }