@article{AltafimAltafimQiuetal.2012,
  author    = {Ruy Alberto Pisani Altafim and Ruy Alberto Pisani Altafim and Xunlin Qiu and Sebastian Raabe and Werner Wirges and Heitor Cury Basso and Reimund Gerhard},
  title     = {Fluoropolymer piezoelectrets with tubular channels resonance behavior controlled by channel geometry},
  journal   = {Applied physics : A, Materials science \& processing},
  volume    = {107},
  number    = {4},
  pages     = {965 -- 970},
  doi       = {10.1007/s00339-012-6848-z},
  year      = {2012},
}