55. Luo, S.J., Kim, J.H., Johnson, W.E., Walt, J. van der, Martenson, J., Yuhki, N., Miquelle, D.G., Uphyrkina, O., Goodrich, J., Quigley, H.B., Tilson, R., Brady, G., Martelli, P., Subramaniam, V., McDougal, C., Hean, S., Huang, S.Q., Pan, W., Karanth, K.U., Sunquist, M.E., Smith, J.L.D. & O’Brien, S.J. (2004) Phylogeography and genetic ancestry of tigers (Panthera tigris). PLoS Biology, 2, e442.