Sessler, G.M.; West, J.E. (1962). "Self-Biased Condenser Microphone with High Capacitance". Journal of the Acoustical Society of America. 34 (11): 1787–1788. Bibcode:1962ASAJ...34.1787S. doi:10.1121/1.1909130.
Wong, Kainam; Nnonyelu, Chibuzo; Wu, Yue (February 2018). "A Triad of Cardioid Sensors in Orthogonal Orientation and Spatial Collocation – Its Spatial-Matched-Filter-Type Beam-Pattern". IEEE Transactions on Signal Processing. 66 (4): 895–906. Bibcode:2018ITSP...66..895W. doi:10.1109/TSP.2017.2773419. S2CID3298960.
Sessler, G.M.; West, J.E. (1962). "Self-Biased Condenser Microphone with High Capacitance". Journal of the Acoustical Society of America. 34 (11): 1787–1788. Bibcode:1962ASAJ...34.1787S. doi:10.1121/1.1909130.
Wong, Kainam; Nnonyelu, Chibuzo; Wu, Yue (February 2018). "A Triad of Cardioid Sensors in Orthogonal Orientation and Spatial Collocation – Its Spatial-Matched-Filter-Type Beam-Pattern". IEEE Transactions on Signal Processing. 66 (4): 895–906. Bibcode:2018ITSP...66..895W. doi:10.1109/TSP.2017.2773419. S2CID3298960.
Wong, Kainam; Nnonyelu, Chibuzo; Wu, Yue (February 2018). "A Triad of Cardioid Sensors in Orthogonal Orientation and Spatial Collocation – Its Spatial-Matched-Filter-Type Beam-Pattern". IEEE Transactions on Signal Processing. 66 (4): 895–906. Bibcode:2018ITSP...66..895W. doi:10.1109/TSP.2017.2773419. S2CID3298960.