Conflicts in national parks: a case study of helicopters and bighorn sheep time budgets in the Grand Canyon. Stockwell, C. & Bateman, G. Biological Conservation, 56:317–328, 1991.
bibtex   
@article{stockwell_conflicts_1991,
	title = {Conflicts in national parks: a case study of helicopters and bighorn sheep time budgets in the {Grand} {Canyon}.},
	volume = {56},
	language = {en},
	journal = {Biological Conservation},
	author = {Stockwell, C.A. and Bateman, G.C.},
	year = {1991},
	pages = {317--328},
}

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