1. Piezoelectric Materials in Devices;Setter,2002
2. Ferroelectric Ceramics: History and Technology
3. European Standards, Directive 2011/65/EU on the Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment,2011
4. JIS C 0950: The Marking for Presence of the Specific Chemical Substances for Electrical and Electronic Equipment,2005