@article{johansen1994on, title = {On the Directivity of Horn Loudspeakers}, author = {Johansen, Tonni Franke}, journal = {J. Audio Eng. Soc}, volume = {42}, number = {12}, pages = {1008--1019}, year = {1994}, url = {https://www.aes.org/e-lib/browse.cfm?elib=6913} }