1. NSA 14:12947 AEC-tr-4049, Inorganic Chemistry—The Existence of Continuous Transition of Quadratic Structure to Cubic in Rare Earth Zirconium Oxide Systems.
2. Compt.;Lefebvre;Rend. 249 2329,1959
3. Etude des Systemes Zircone-Oxydes de Terres Rares;Ann. Chim.,1962
4. NSA 19:22191, Reactions of Hafnium Hydroxide with Yttrium, Lanthanum, Neodynium and Ytterbium Hydroxis.