@article{erhorn1962transistorized, title = {Transistorized Three-Channel Mixing Console for Simultaneous FM Multiplex and AM Broadcasting}, author = {Erhorn, Philip C.}, journal = {J. Audio Eng. Soc}, volume = {10}, number = {2}, pages = {130--134}, year = {1962}, url = {https://www.aes.org/e-lib/browse.cfm?elib=863} }