@misc{indiciaebbe8b240a028,
  title = {Fractal lognormal percentage assessment of porphyry copper resources},
  author = {R. A. Crovelli and S. B. Suslick and Donald A. Singer and R.H. Balay},
  year = {1995},
  url = {https://pubs.usgs.gov/publication/70197273},
  note = {Source identifier: 70197273}
}