@misc{indiciae910d9819f3ee,
  title = {PROSPECTS FOR EARLY MANNED INTERPLANETARY FLIGHT},
  author = {Gillespie, R. W. and Ragsac, R. V. and Ross, S.},
  year = {1963},
  url = {https://ntrs.nasa.gov/citations/19630019161},
  note = {Source identifier: 19630019161}
}