@misc{indiciaeed205d9feeba,
  title = {Launch window analysis for round trip Mars missions.},
  author = {Deerwester, J. M. and Manning, L. A. and Swenson, B. L.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19680056778},
  note = {Source identifier: 19680056778}
}