@misc{indiciae17240403a27b,
  title = {Thermionic research and development program Quarterly progress report},
  author = {Campbell, A. and Hamerdinger, R. and Jacobson, D. L.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19680022016},
  note = {Source identifier: 19680022016}
}