@misc{indiciaee505089a931a,
  title = {Cycler orbit between Earth and Mars},
  author = {Byrnes, Dennis V. and Longuski, James M. and Aldrin, Buzz},
  year = {1993},
  url = {https://ntrs.nasa.gov/citations/19930054986},
  note = {Source identifier: 19930054986}
}