@misc{indiciaef560680b3219,
  title = {A discrete-time differential dynamic programming algorithm with application to optimal orbit transfer},
  author = {Gershwin, S. B. and Jacobson, D. H.},
  year = {1970},
  url = {https://ntrs.nasa.gov/citations/19700065621},
  note = {Source identifier: 19700065621}
}