Smith, F.A., Brown, J.H., Haskell, J.P., Alroy, J. Charnov, E. L., Dyan, T., Enquist, B.J., Ernest, M. S.K., Hadly, E.A., Jablonski, D., Jones, K.E., Kaufman, D.M., Lyons, S.K., Marquet, P.A., Niklas, K. Maurer, B.A., Porter, W. Roy, K. Tiffney, B., and Willig, M.R. (2004)
Similarity of mammalian body size across the taxonomic hierarchy and across space and time. American Naturalist 163: 672-691.