1. H.S. Nalwa (ed.), Ferroelectric Polymers: Chemistry, Physics and Applications (Marcel Dekker, New York, 1995)
2. http://www.meas-spec.com/myMeas/sensors/piezo.asp
;
http://piezotech.fr
3. see for example
http://www.rp-acoustics.de/english/PVDF_e.htm
4. information of the company AVL, Austria,
http://www.avlditest.com
5. F. Bauer, IEEE Trans. Ultrason. Ferroelectr. Freq. Contr., 47, 1448 (2000)