@article{krning1982an, title = {An Amplifier for Electret Headphones}, author = {Kröning, Manfred and Lerch, Richard and Zahn, Rolf}, journal = {J. Audio Eng. Soc}, volume = {30}, number = {9}, pages = {607--609}, year = {1982}, url = {https://www.aes.org/e-lib/browse.cfm?elib=3822} }