@misc{indiciaecad12ca1c468,
  title = {Mission analysis data for inclined geosynchronous orbits, part 1},
  author = {Graf, O. F., Jr. and Wang, K. C.},
  year = {1980},
  url = {https://ntrs.nasa.gov/citations/19800017840},
  note = {Source identifier: 19800017840}
}