@misc{indiciae99eadb06ea5a,
  title = {2018 NASA Green Propulsion Technology Development Roadmap},
  author = {Cavender, D. P. and Marshall, W. M. and Maynard, A. P.},
  year = {2018},
  url = {https://ntrs.nasa.gov/citations/20180006412},
  note = {Source identifier: 20180006412}
}