@misc{indiciaefd37dbebf345,
  title = {The partitioning of copper among selected phases of geologic media of two porphyry copper districts, Puerto Rico},
  author = {R. E. Learned and T. T. Chao and R. F. Sanzolone},
  year = {1981},
  doi = {10.1016/0375-6742(81)90087-x},
  url = {https://pubs.usgs.gov/publication/70011740},
  note = {Source identifier: 70011740}
}