Modern Aspects of Rare Earths and their Complexes - Vinny R. Sastri, J.R. Perumareddi, V. Ramachandra Rao, G.V.S. Rayudu, J.-C. G. Bünzli - Google Books

https://books.google.de/books?id=5Xd-_a0vX6IC&pg=PA13#v=onepage

In order to use rare earths successfully in various applications, a good understanding of the chemistry of these elements is of paramount importance. Nearly three to four decades have passed since titles such as The Rare Earths edited by F.H. Spedding and…