Sanz, J., & Stone, WEE. (1983). Nmr-study of Minerals .3. the Distribution of Mg-2+ and Fe-2+ Around the Oh Groups in Micas. Journal of Physics C: Solid State Physics, 16(7), 1271-1281. https://doi.org/10.1088/0022-3719/16/7/013 (Original work published 1983)