@article{burhans1972ttl, title = {TTL Circuits for Monophonic Devices}, author = {Burhans, Ralph W.}, journal = {J. Audio Eng. Soc}, volume = {20}, number = {10}, pages = {829--834}, year = {1972}, url = {https://www.aes.org/e-lib/browse.cfm?elib=2017} }