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O’Brien, T.G., J.E.M. Baillie, L. Krueger, and M. Cuke. 2010. The Wildlife Picture Index: Monitoring top trophic levels. Animal Conservation. 13:335-343. 
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O’Brien, T.G., M.F. Kinnaird, and H.T. Wibisono. 2010. Estimation of species richness of large vertebrates using camera traps: An examples from an Indonesian rainforest. in O’Connell, A.F.; Nichols, J.D.; Karanth, K.U. . Camera Traps in Animal Ecology: Methods and Analyses. Springer Verlag, Tokyo. 
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