@misc{indiciaef6b71cd3045a,
  title = {Ion propulsion},
  author = {Meserole, J. S. and Keefer, Dennis and Ruyten, Wilhelmus M. and Peng, Xiaohang},
  year = {1989},
  url = {https://ntrs.nasa.gov/citations/19960022969},
  note = {Source identifier: 19960022969}
}