@misc{indiciaedd4ec2039851,
  title = {Thermionic cathode evaluation study Interim report, 1 Apr. - 30 Jun. 1969},
  author = {Hill, F. T.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19690029271},
  note = {Source identifier: 19690029271}
}