@misc{indiciae28a59acd11e0,
  title = {Interplanetary trajectory Encke method FORTRAN program manual for the IBM system/360},
  author = {Lefton, L. and Levine, N. and Whitlock, F. H. and Wolf, H.},
  year = {1970},
  url = {https://ntrs.nasa.gov/citations/19700030507},
  note = {Source identifier: 19700030507}
}