Testing the inverse-square law of gravity in boreholes at the Nevada Test Site.

@article{Thomas1990TestingTI,
  title={Testing the inverse-square law of gravity in boreholes at the Nevada Test Site.},
  author={Jens Thomas and Vogel},
  journal={Physical review letters},
  year={1990},
  volume={65 10},
  pages={1173-1176}
}