C. H.  Schulze, Waltert, M., Kessler, P. J. A., Pitopang, R., ,, Veddeler, D., Muhlenberg, M., Gradstein, S. R., Leuschner, C., Steffan-Dewenter, I., and Tscharntke, T., ?Biodiversity indicator groups of tropical land-use systems: Comparing plants, birds, and insects?, Ecological Applications, vol. 14, pp. 1321-1333, 2004.