@misc{indiciae178549a9a7ea,
  title = {Calculation of free-fall trajectories using numerical optimization methods.},
  author = {Hull, D. G. and Fowler, W. T. and Gottlieb, R. G.},
  year = {1972},
  url = {https://ntrs.nasa.gov/citations/19720050355},
  note = {Source identifier: 19720050355}
}