@misc{indiciae7b61494362d5,
  title = {A mechanism for three axis control of an ion thruster array},
  author = {Ferrera, J. D. and Johnson, K. G. and Masek, T. D. and Perkins, G. S.},
  year = {1970},
  url = {https://ntrs.nasa.gov/citations/19700065668},
  note = {Source identifier: 19700065668}
}