@article{jensen1979accurate, title = {Accurate Measurement of Tape-Head Wear Using Isotopes}, author = {Jensen, Jørgen Selmer}, journal = {J. Audio Eng. Soc}, volume = {27}, number = {5}, pages = {380--385}, year = {1979}, url = {https://www.aes.org/e-lib/browse.cfm?elib=3199} }