Herbillon, AJ., Frankart, R., & Vielvoye, L. (1981). An Occurrence of Interstratified Kaolinite-smectite Minerals in a Red-black Soil Toposequence. Clay Minerals : journal of the European Clay Groups, 16(2), 195-201. https://doi.org/10.1180/claymin.1981.016.2.07 (Original work published 1981)