Observer variability in estimating numbers: an experiment. Erwin, R. M. Journal of Field Ornithology, 53:159–167, 1982.
bibtex   
@ARTICLE{Erw82,
  author = {Erwin, R. M.},
  title = {Observer variability in estimating numbers: an experiment},
  journal = {Journal of Field Ornithology},
  year = {1982},
  volume = {53},
  pages = {159--167},
  subdatabase = {distance}
}

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