@misc{indiciae0af609e30744,
  title = {Carbonatite tuffs in the Laetolil Beds of Tanzania and the Kaiserstuhl in Germany},
  author = {R. L. Hay and J. R. O’Neil},
  year = {1983},
  doi = {10.1007/bf00399717},
  url = {https://pubs.usgs.gov/publication/70011442},
  note = {Source identifier: 70011442}
}