@article{WirgesWegenerVoroninaetal.2007,
  author    = {Werner Wirges and Michael Wegener and Olena Voronina and Larissa Zirkel and Reimund Gerhard},
  title     = {Optimized preparation of elastically soft, highly piezoelectric, cellular ferroelectrets from nonvoided poly(ethylene terephthalate) films},
  doi       = {10.1002/adfm.200600162},
  url       = {http://onlinelibrary.wiley.com/doi/10.1002/adfm.200600162/pdf},
  year      = {2007},
}