@misc{indiciaeeb17ad693190,
  title = {Gap analysis: Concepts, methods, and recent results},
  author = {M.D. Jennings},
  year = {2000},
  doi = {10.1023/a:1008184408300},
  url = {https://pubs.usgs.gov/publication/70022517},
  note = {Source identifier: 70022517}
}