@misc{indiciae37780d974879,
  title = {Thermionic reactors for electric propulsion - Parametric studies.},
  author = {Gietzen, A. J. and Heath, C. A. and Homeyer, W. G.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19680051108},
  note = {Source identifier: 19680051108}
}