@article{hilliard1966development, title = {Development of Horn-Type Moving Coil Driver Unit}, author = {Hilliard, John K. and Renkus, Jonas A.}, journal = {J. Audio Eng. Soc}, volume = {14}, number = {4}, pages = {328--331}, year = {1966}, url = {https://www.aes.org/e-lib/browse.cfm?elib=1130} }