@misc{indiciae5b18f180e107,
  title = {Electrostatic propulsion beam divergence effects on spacecraft surfaces, volume 3},
  author = {Kemp, R. F. and Hall, D. F. and Luedke, E. E.},
  year = {1973},
  url = {https://ntrs.nasa.gov/citations/19740009397},
  note = {Source identifier: 19740009397}
}