@article{lybarger1966performance, title = {Performance Measurement on Ear-Level Hearing Aids}, author = {Lybarger, Samuel F.}, journal = {J. Audio Eng. Soc}, volume = {14}, number = {2}, pages = {126--131}, year = {1966}, url = {https://www.aes.org/e-lib/browse.cfm?elib=1159} }