@misc{indiciae081a2d558511,
  title = {Thermionic cathode evaluation study Interim report, 1 Oct. - 31 Dec. 1968},
  author = {Hill, F. T.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19690011765},
  note = {Source identifier: 19690011765}
}