@article{hallgren1975on, title = {On the Noise Performance of a Magnetic Phonograph Pickup}, author = {Hallgren, Björn I.}, journal = {J. Audio Eng. Soc}, volume = {23}, number = {7}, pages = {546--552}, year = {1975}, url = {https://www.aes.org/e-lib/browse.cfm?elib=2674} }