@misc{indiciaeb1335e7ffc0b,
  title = {Analysis of exceptionally large tremors in two gold mining districts of South Africa},
  author = {Art McGarr and J. Bicknell and E. Sembera and R.W.E. Green},
  year = {1989},
  doi = {10.1007/bf00874511},
  url = {https://pubs.usgs.gov/publication/70015389},
  note = {Source identifier: 70015389}
}