@article{levin1972portable, title = {Portable Data Acquisition Unit for Word Recognition Research}, author = {Levin, Herman and Lord, William}, journal = {J. Audio Eng. Soc}, volume = {20}, number = {8}, pages = {656--663}, year = {1972}, url = {https://www.aes.org/e-lib/browse.cfm?elib=2035} }