@misc{indiciae4edd79bb2e77,
  title = {A proposed lunar orbiting gravity gradiometer experiment.},
  author = {Debra, D. B. and Harrison, J. C. and Muller, P. M.},
  year = {1972},
  url = {https://ntrs.nasa.gov/citations/19720046845},
  note = {Source identifier: 19720046845}
}