1. Electroceramics IX;Ringgaard,2004
2. M.D. Maeder, D. Damjanovic, Piezoelectric Materials and Devices, N. Setter (Ed.), Swiss Federal Institute of Technology, Lausanne, 2002, p. 67.
3. Directive 2002/96/EC of the European Parliament and of the Council of 27.01.2003 on Waste Electrical and Electronic Equipment (WEEE), Official Journal of the European Union L37/24–L37/38.
4. Lead-free piezoceramics
5. Lead-free at last