Ozanne, C.M.P., Anhuf, D., Boulter, S.L., Keller, M., Kitching, R.L., Körner, C., Meinzer, F.C., Mitchell, A.W., Nakashizuka, T., Silva Dias, P.L., Stork, N.E., Wright, S.J., and Yoshimura, M. (2003) Biodiversity meets the atmosphere: a global view of forest canopies. Science, 301 (5630). pp. 183-186.