TY - JOUR A1 - Zhong-Fu, X. A1 - Shan-Shan, M. A1 - Jia-Qian, Z. A1 - Xun-Lin, Q. A1 - Ye-Wen, Z. A1 - Gerhard, Reimund A1 - Künstler, Wolfgang T1 - Piezoelectric activity and its stability of polytetrafluoroethylene (PTFE) films Y1 - 2003 ER -