@article{olson1964unitized, title = {Unitized Stereophonic Loudspeaker with Acoustically Augmented Separation of the Sound Sources}, author = {Olson, Harry F.}, journal = {J. Audio Eng. Soc}, volume = {12}, number = {1}, pages = {40--44}, year = {1964}, url = {https://www.aes.org/e-lib/browse.cfm?elib=761} }