@article{FangWangWirgesetal.2011,
  author    = {Peng Fang and Feipeng Wang and Werner Wirges and Reimund Gerhard and Heitor Cury Basso},
  title     = {Three-layer piezoelectrets from fluorinated ethylene-propylene (FEP) copolymer films},
  journal   = {Applied physics : A, Materials science \& processing},
  volume    = {103},
  number    = {2},
  pages     = {455 -- 461},
  doi       = {10.1007/s00339-010-6008-2},
  year      = {2011},
}