@article{isom1977record, title = {Record Materials, Part 2: Evolution of the Disc Talking Machine}, author = {Isom, Warren R.}, journal = {J. Audio Eng. Soc}, volume = {25}, number = {10/11}, pages = {718--723}, year = {1977}, url = {https://www.aes.org/e-lib/browse.cfm?elib=3334} }