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2. L. Jin and S. Xiao, Dept of Biology, Duke Univ., Durham, NC, USA.
3. W. Mbamy, G. N. Obiang, T. Nkoghe and M. O. Ebanega, Dépt de Géographie, Univ. Omar Bongo, Libreville, Gabon.
4. C. Rundel, Dept of Statistical Science, Duke Univ., Durham, NC, USA.