@article{article81478095,
title   = {Fluoropolymer piezoelectrets with tubular channels: resonance behavior controlled by channel geometry},
author = {Altafim, Ruy Alberto Pisani and Altafim, Ruy Alberto Corrêa and Xunlin, Qiu and Raabe, Sebastian and Wirges, Werner and Basso, Heitor Cury and Gerhard, Reimund},
year = {2012},
doi = {10.1007/s00339-012-6848-z},
journal   = {Applied Physics A}
}