@misc{indiciaec967e588f9b9,
  title = {Optimization of ''ephemeridal'' parameters for minimum propellant requirements on multiplanet roundtrip swingby-stopover missions.},
  author = {Mead, C. W. and Young, A. C.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19680057758},
  note = {Source identifier: 19680057758}
}