@article{inoue1974measurement, title = {Measurement of Recorded Level and Channel Separation on Phonograph Discs Using Optical Interferometry Techniques}, author = {Inoue, T. and Owaki, I. and Ohba, K. and Nakamura, S. and Eargle, John}, journal = {J. Audio Eng. Soc}, volume = {22}, number = {9}, pages = {704--705}, year = {1974}, url = {https://www.aes.org/e-lib/browse.cfm?elib=2727} }