@conference{beauchamp1964the, title = {The Harmonic Tone Generator, a Voltage-Controlled Device for Additive Synthesis of Audio Harmonic Spectra}, author = {Beauchamp, James W.}, booktitle = {Audio Engineering Society Convention 16}, month = {Oct}, year = {1964}, url = {https://www.aes.org/e-lib/browse.cfm?elib=625} }