@misc{indiciae987102039b1c,
  title = {Thermionic cathode evaluation study Interim report, 1 Oct. - 31 Dec. 1967},
  author = {Hill, F. H.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19680009894},
  note = {Source identifier: 19680009894}
}