1. “Piezoelectricity.”;Cady,1946
2. “Quartz Crystals for Electrical Circuits.”;Heising,1946
3. “Quartz Vibrators and Their Applications.”;Vigoreux,1950
4. “Piezoelectric Crystals and Their Application to Ultrasonics.”;Mason,1950
5. IRE Standards on Piezoelectric Crystals (1949). Proc. IRE 37, 1378.