@article{cooper1973qmx, title = {QMX Carrier-Channel Disc}, author = {Cooper, Duane H. and Shiga, Takeo and Takagi, Toshihiko}, journal = {J. Audio Eng. Soc}, volume = {21}, number = {8}, pages = {614--624}, year = {1973}, url = {https://www.aes.org/e-lib/browse.cfm?elib=1944} }