1. Rare earth elements adsorption on clay minerals;Aagard;Bulletin du Groupe Francais des Argiles,1974
2. Alexander, L.T., Cady, J.G., 1962. Genesis and Hardening of Laterite in Soils. Technical Bulletin of the United States Department of Agriculture, vol. 1282, 90 pp.
3. Formation of bauxite from basaltic rocks of Oregon;Allen;Economic Geology,1948
4. Geochemistry, Groundwater and Pollution;Appelo,1993
5. Rapid determination of REEs and other trace elements in geological samples by microwave acid digestion and ICP-MS;Balaram;Atomic Spectroscopy,2003