@conference{cooper1973qmx, title = {QMX Carrier-Channel Disc}, author = {Cooper, Duane H. and Shiga, Takeo and Takagi, Toshihiko}, booktitle = {Audio Engineering Society Convention 45}, month = {May}, year = {1973}, url = {https://www.aes.org/e-lib/browse.cfm?elib=1718} }