@misc{indiciae116b9c3de739,
  title = {Breakthrough Propulsion Study: Assessing Interstellar Flight Challenges and Prospects},
  author = {Marc G. Millis and Greason, Jeff and Stevenson, Rhonda},
  year = {2018},
  url = {https://ntrs.nasa.gov/citations/20180006480},
  note = {Source identifier: 20180006480}
}