@article{bost1975a, title = {A New Type of Tweeter Horn Employing a Piezoelectric Driver}, author = {Bost, Jonathan R.}, journal = {J. Audio Eng. Soc}, volume = {23}, number = {10}, pages = {796--801}, year = {1975}, url = {https://www.aes.org/e-lib/browse.cfm?elib=2653} }