@misc{indiciae8d481473491c,
  title = {NASA 2018 Green Propulsion Roadmap},
  author = {Cavender, Dan and Marshall, Bill and Maynard, Andrew P.},
  year = {2018},
  url = {https://ntrs.nasa.gov/citations/20180005461},
  note = {Source identifier: 20180005461}
}