Sanz, J., & Stone, WEE. (1983). Nmr Applied To Minerals .4. Local Order in the Octahedral Sheet of Micas - Fe-f Avoidance. Clay Minerals : journal of the European Clay Groups, 18(2), 187-192. https://doi.org/10.1180/claymin.1983.018.2.07 (Original work published 1983)