@misc{indiciaef87f26a441f8,
  title = {Field ionization data using a graphite emitter},
  author = {Bryant, P. J. and Clow, W. L. and Gutshall, P. L.},
  year = {1971},
  url = {https://ntrs.nasa.gov/citations/19710039158},
  note = {Source identifier: 19710039158}
}