@misc{indiciae0c94cf929ade,
  title = {Thermionic research and development program Final report, 15 Jul. 1966 - 15 Jan. 1968},
  author = {Campbell, A. E. and Jacobson, D. L.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19680022713},
  note = {Source identifier: 19680022713}
}