@misc{indiciae4ad3a2ed0826,
  title = {Oxygen effects in tantalum thermionic emitters.},
  author = {De Steese, J. G. and Luebbers, S. S.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19690043823},
  note = {Source identifier: 19690043823}
}