1. Khitarov DN, Sobolev BP, Alexeeva IV. The Rare Earth Trifluorides, Part 2 Arxius de les Seccions de Ciències. Barcelona: Institut d’Estudis Catalans, per a aquesta edicio Carrer del Carme; 2000. ISBN: 847283610X, ISBN: 9788472836105
2. Leicester HM. The Historical Background of Chemistry. New York: Dover Publications, Inc.; 1971. ISBN: 9780486610535
3. Geng HY, Song HX, Wu Q. Anomalies in nonstoichiometric uranium dioxide induced by a pseudo phase transition of point defects. Physical Review B. 2012;85(14):144111
4. Barnes HL. Geochemistry of Hydrothermal Ore Deposits. New York: John Wiley Publications; 1997. pp. 382-390. ISBN: 978-0-471-57144-5
5. Atkins PW, Overton TL, Rourke JP, Weller MT, Armstrong FA. Shriver and Atkins’ Inorganic Chemistry. 5th ed. Great Britain: Oxford University Press; 2010