Effects of survey frequency on bird density estimates in the shrub-steppe environment. Brandt, C. A. & Rickard, W. H. Northwest Science, 66:172–182, 1992.
bibtex   
@ARTICLE{BraRic92,
  author = {Brandt, C. A. and Rickard, W. H.},
  title = {Effects of survey frequency on bird density estimates in the shrub-steppe
	environment},
  journal = {Northwest Science},
  year = {1992},
  volume = {66},
  pages = {172--182},
  subdatabase = {distance}
}
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