@misc{indiciae8dd3c8728a4c,
  title = {Lunar physical librations and laser ranging},
  author = {Williams, J. G. and Slade, M. A. and Eckhardt, D. H. and Kaula, W. M.},
  year = {1973},
  url = {https://ntrs.nasa.gov/citations/19740032113},
  note = {Source identifier: 19740032113}
}