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S.A. Wich, - and G.M. Fredriksson, - and G. Usher, - and H.H. Peters, - and D. Priatna, - and F. Basalamah, - and W. Susanto, - and H. Kühl, - (2012) Hunting of Sumatran orang-utans and its importance in determining distribution and density. Biological Conservation, 146. pp. 163-169.