@article{bauer1971a, title = {A Compatible Stereo-Quadraphonic (SQ) Record System}, author = {Bauer, Benjamin B. and Gravereaux, Daniel W. and Gust, Arthur J.}, journal = {J. Audio Eng. Soc}, volume = {19}, number = {8}, pages = {638--646}, year = {1971}, url = {https://www.aes.org/e-lib/browse.cfm?elib=2148} }