Pirlot, R., Cyamukungu, M., Demeure, R., Grenacs, L., Lehmann, J., Tompa, K., & Urbain, X. (1989). Hyperfine Interaction of Solutes in Noble-metals. Hyperfine Interactions, 51(1-4), 839. https://doi.org/10.1007/BF02407788 (Original work published 1989)