Problems in estimating population size through counts of singing males. Mayfield, H. F. In Ralph, C. J. & Scott, J. M., editors, Estimating Numbers of Terrestrial Birds, of Studies in Avian Biology, pages 220–224. Cooper Ornithological Society, 1981.
bibtex   
@INCOLLECTION{May81,
  author = {Mayfield, H. F.},
  title = {Problems in estimating population size through counts of singing
	males},
  booktitle = {Estimating Numbers of Terrestrial Birds},
  publisher = {Cooper Ornithological Society},
  year = {1981},
  editor = {C. J. Ralph and J. M. Scott},
  number = {6},
  series = {Studies in Avian Biology},
  pages = {220--224},
  subdatabase = {distance}
}

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