@misc{indiciaec78059c1df3a,
  title = {Improved nullification of gravity gradients.},
  author = {R Friedberg},
  year = {1987},
  doi = {10.1103/physrevd.36.386},
  url = {https://pubmed.ncbi.nlm.nih.gov/9958184/},
  note = {Source identifier: 9958184}
}