A comparison of orang-utan density in a logged and unlogged forest on Sumatra. Knop, E., Ward, P., & Wich, S. A. Biological Conservation, 120(2):187–192, 2004.
bibtex   
@article{knopComparisonOrangutanDensity2004,
	title = {A comparison of orang-utan density in a logged and unlogged forest on {Sumatra}},
	volume = {120},
	number = {2},
	journal = {Biological Conservation},
	author = {Knop, E. and Ward, P.I. and Wich, S. A.},
	year = {2004},
	pages = {187--192},
}

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