@conference{ong1964on, title = {On the Measurement of Vertical Recorded Angle in Stereo Disc Recording}, author = {Ong, Daniel H. T. and Ward, H. D.}, booktitle = {Audio Engineering Society Convention 16}, month = {Oct}, year = {1964}, url = {https://www.aes.org/e-lib/browse.cfm?elib=600} }