@misc{indiciae4e9e3c872d37,
  title = {A Van de Graaf source mechanism for middle atmospheric vertical electric fields},
  author = {Aikin, A. C. and Maynard, N. C.},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19910033816},
  note = {Source identifier: 19910033816}
}