@misc{indiciae1f3736114ede,
  title = {Solar Electric Propulsion Concepts for Human Space Exploration},
  author = {Mercer, Carolyn R. and McGuire, Melissa L. and Oleson, Steven R. and Barrett, Michael J.},
  year = {2015},
  url = {https://ntrs.nasa.gov/citations/20150019856},
  note = {Source identifier: 20150019856}
}