@misc{indiciae1d54b5e6bdd0,
  title = {The tract aggregation problem in probabilistic mineral resource assessment},
  author = {Keith Long and Lawrence Drew and John Schuenemeyer and David M. Sutphin},
  year = {2010},
  url = {https://pubs.usgs.gov/publication/70159355},
  note = {Source identifier: 70159355}
}