1. https://en.wikipedia.org/wiki/Cerium(IV)_oxide.
2. https://en.wikipedia.org/wiki/Cerium(III)_oxide.
3. W.D. Schneider, “Lanthanides,” Chapter 2.5, Photoemission of Solids, Landolt-Bornstein New Series, Group III, Vol. 23, Eds. A. Goldmann and E.E Koch, Subvolume a, Berlin, 1989; 314.
4. Ordered Intermediate phases in the system CeO2--Ce203;Bevan;J. Inorganic Nuclear Chem.,1955
5. The crystal structure of A-Ce203;Baernighausen;J. Less-Common Metals,1985