Evaluation of an aerial survey of Pacific walruses. Estes, J. A. & Gilbert, J. R. Journal of the Fisheries Research Board of Canada, 35:1130–1140, 1978.
bibtex   
@ARTICLE{EstGil78,
  author = {Estes, J. A. and Gilbert, J. R.},
  title = {Evaluation of an aerial survey of {P}acific walruses},
  journal = {Journal of the Fisheries Research Board of Canada},
  year = {1978},
  volume = {35},
  pages = {1130--1140},
  subdatabase = {distance}
}

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