@article{RychkovGerhard2011,
  author    = {Dmitry Rychkov and Reimund Gerhard},
  title     = {Stabilization of positive charge on polytetrafluoroethylene electret films treated with titanium-tetrachloride vapor},
  journal   = {Applied physics letters},
  volume    = {98},
  number    = {12},
  doi       = {10.1063/1.3565166},
  year      = {2011},
}