1. Characteristic Structural Phase Transition in Perovskite-Type Compounds
2. Nakazumi Crystals Corp., Ikeda-Shi, Osaka-fu, Japan; National Lead, Titanium Division, South Amboy, NJ 00879, USA.
3. U.S. Patents 2,628,156 (1953); 2,684,910 (1954); 2,723,915 (1955).