@misc{indiciaec19f4d735ff2,
  title = {Interaction assessment: Rationale and a test using plants},
  author = {J.M. Emlen and D.C. Freeman and F. Wagstaff},
  year = {1989},
  doi = {10.1007/bf02270916},
  url = {https://pubs.usgs.gov/publication/70161971},
  note = {Source identifier: 70161971}
}