@article{FangHollaenderWirgesetal.2012,
  author    = {Peng Fang and Lars Hollaender and Werner Wirges and Reimund Gerhard},
  title     = {Piezoelectric d(33) coefficients in foamed and layered polymer piezoelectrets from dynamic mechano-electrical experiments, electro-mechanical resonance spectroscopy and acoustic-transducer measurements},
  journal   = {Measurement science and technology},
  volume    = {23},
  number    = {3},
  doi       = {10.1088/0957-0233/23/3/035604},
  year      = {2012},
}