@misc{indiciae40b052c6dbc7,
  title = {OPR-PPR, a computer program for assessing data importance to model predictions using linear statistics},
  author = {Matthew J. Tonkin and Claire R. Tiedeman and D. Matthew Ely and Mary C. Hill},
  year = {2007},
  doi = {10.3133/tm6e2},
  url = {https://pubs.usgs.gov/publication/tm6E2},
  note = {Source identifier: tm6E2}
}