@misc{indiciae978b78e2cf52,
  title = {Isotopic constraints on the genesis of base-metal ores in southern and central Sardinia},
  author = {K.R. Ludwig and R. Vollmer and B. Turi and K. R. Simmons and G. Perna},
  year = {1989},
  url = {https://pubs.usgs.gov/publication/70015075},
  note = {Source identifier: 70015075}
}