@misc{indiciae4093e57ca1ad,
  title = {Thermionic cathode evaluation study Interim report, 1 Jan. - 31 Mar. 1969},
  author = {Hill, F. T.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19690024119},
  note = {Source identifier: 19690024119}
}