1. G. Haertling, J. Am. Ceram. Soc. 82, 797 (1999)
2. B. Jaffe et al., Piezoelectric ceramics (Academic, New York, 1971), p. 92
3. Directive 2002/96/EC of the European Parliament and Council on waste and electrical and electronic equipment (WEEE).
4. Directive 2002/95/EC of the European Parliament and Council on the restriction of the use of certain hazardous substances in electrical and electronic equipment (RHS).
5. Lead-free Roadmap V1.3 for commercialization of lead-free solder and components, Japan Electronics and Information Technology Industries Association (2002).