@misc{indiciaee118ef20b4c6,
  title = {Guidance, Flight Mechanics and Trajectory Optimization. Volume 9 - General Perturbations Theory},
  author = {Kampos, B.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19680010981},
  note = {Source identifier: 19680010981}
}