@misc{indiciaead1d73c47f1b,
  title = {Minimum propellant consumption round-trip trajectories to Mars for constant-thrust, constant-specific-impulse vehicles with optimum coasting periods},
  author = {Fishbach, L. H. and Zola, C. L.},
  year = {1966},
  url = {https://ntrs.nasa.gov/citations/19660006201},
  note = {Source identifier: 19660006201}
}