@misc{indiciaed59cf33805aa,
  title = {Thermionic research and development program Quarterly progress report},
  author = {Campbell, A. E. and Hamerdinger, R. and Jacobson, D. L.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19690002686},
  note = {Source identifier: 19690002686}
}