Wasser, S., Poole, P., Lee, P., Lindsay, K., Dobson, A. Hart, J., Douglas-Hamilton, I., Wittemyer, G., Granli, P., Morgan, B.,  Gunn, J.,   Alberts, S., Beyers, R., Chiyo, P., Croze, H., Estes, R., Gobush, K., Joram, P., Kikoti, A., Kingdon, J., King, L., Macdonald, D., Moss, C., Mutayoba, B., Njumbi, S., Omondi, P. and Nowak, K. 2010.  Elephants, Ivory, and Trade. Science 327 (597): 1331 – 1332.