Gmelin Handbook of Inorganic and Organometallic Chemistry. 8th edition. (Handbuch der anorganischen Chemie). Sc, Y, La-Lu Rare Earth Elements A 6b: Y, La, and the Lanthanoids: Geochemistry: Hydrosphere. Atmosphere. Cosmo- and Geochemical Cycles. Balanace. By Bärbel Sarbas a.o. 2 illustrations.