@misc{indiciaee510e27836bb,
  title = {Summary of applied research program in thermionic conversion during recent years.},
  author = {Lieb, D. and Rufeh, F. and Van Someren, L.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19690051184},
  note = {Source identifier: 19690051184}
}