@misc{indiciae779f7a3efb0a,
  title = {A phenomenological model describing orificed, hollow cathode operation},
  author = {Siegfried, D. E. and Wilbur, P. J.},
  year = {1981},
  url = {https://ntrs.nasa.gov/citations/19810045160},
  note = {Source identifier: 19810045160}
}