@misc{indiciaedbf35eac71da,
  title = {Instellar Exploration: Propulsion Options for Precursors and Beyond},
  author = {Johnson, Charles Les and Leifer, Stephanie},
  year = {1999},
  url = {https://ntrs.nasa.gov/citations/19990099689},
  note = {Source identifier: 19990099689}
}