@misc{indiciae5219506e1a89,
  title = {Thermionic cathode evaluation study Final report, 1 Jan. 1967 - 30 Sep. 1969},
  author = {Hill, F. T.},
  year = {1970},
  url = {https://ntrs.nasa.gov/citations/19700016565},
  note = {Source identifier: 19700016565}
}