Declining orangutan encounter rates from Wallace to the present suggest the species was once more abundant. Meijaard, E., Welsh, A., Ancrenaz, M., Wich, S., Nijman, V., & Marshall, A. J PLoS One, 5(8):e12042, 2010.
bibtex   
@article{meijaardDecliningOrangutanEncounter2010,
	title = {Declining orangutan encounter rates from {Wallace} to the present suggest the species was once more abundant},
	volume = {5},
	issn = {1932-6203},
	number = {8},
	journal = {PLoS One},
	author = {Meijaard, Erik and Welsh, Alan and Ancrenaz, Marc and Wich, Serge and Nijman, Vincent and Marshall, Andrew J},
	year = {2010},
	pages = {e12042},
}

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