@article{griese1966self, title = {Self-Calibrating Condenser Microphones with Integrated r-f Circuitry for Acoustical Measurements}, author = {Griese, Hans-Joachim}, journal = {J. Audio Eng. Soc}, volume = {14}, number = {1}, pages = {47--49}, year = {1966}, url = {https://www.aes.org/e-lib/browse.cfm?elib=1174} }