@misc{indiciaebaf79e10b4b1,
  title = {Redundant variables in celestial mechanics},
  author = {Ananda, M. and Broucke, R. and Lass, H.},
  year = {1971},
  url = {https://ntrs.nasa.gov/citations/19710057466},
  note = {Source identifier: 19710057466}
}