@misc{indiciaef9e9322b8bb0,
  title = {Experimental and analytical ion thruster research},
  author = {Wilhelmus M. Ruyten and V. J. Friedly and Xiaohang Peng and Dennis Keefer},
  year = {1993},
  url = {https://ntrs.nasa.gov/citations/19960009790},
  note = {Source identifier: 19960009790}
}