@article{kingsley1972acoustic, title = {Acoustic Evaluation of Prosthetic Cardiac Valve in the Audio Spectrum}, author = {Kingsley, Benedict}, journal = {J. Audio Eng. Soc}, volume = {20}, number = {9}, pages = {750--755}, year = {1972}, url = {https://www.aes.org/e-lib/browse.cfm?elib=2027} }