@misc{indiciaefd18ee7e1acc,
  title = {Field ionization electrodes Patent},
  author = {Barrington, A. E. and Flores, A. L. and Lees, W. L.},
  year = {1971},
  url = {https://ntrs.nasa.gov/citations/19710017202},
  note = {Source identifier: 19710017202}
}