@misc{indiciae74071800ef02,
  title = {Gravitational Harmonics from Shallow Resonant Orbits},
  author = {Wagner, C. A. and Klosko, S. M.},
  year = {1975},
  url = {https://ntrs.nasa.gov/citations/19750022630},
  note = {Source identifier: 19750022630}
}