@misc{indiciae8c7ed2c01738,
  title = {Mars Hybrid Propulsion System Trajectory Analysis: Crew Missions - Part I},
  author = {Chai, Patrick R. and Merrill, Raymond G. and Qu, Min},
  year = {2015},
  url = {https://ntrs.nasa.gov/citations/20160006328},
  note = {Source identifier: 20160006328}
}