, ?The taxonomic distribution of C4 photosynthesis?, in C4 Plant Biology, , Ed. Academic Press, 1999, pp. 552-584.

R. F.  Sage, Wedin, D. A., and Meirong, L., ?The biogeography of c4 photosynthesis ; patterns and controlling factors?, in C4 Plant Biology, R. F.  Sage and Monson, R. K., Eds. Academic Press, 1999.

E. A.  Kellogg, ?The molecular basis of morphological systematics?, in IBC Abstracts, St Louis 1999, St Louis: , 1999, p. 3662.

E. A.  Kellogg, ?Phylogenetic aspects of the evolution of C4 photosynthesis?, in C4 Plant Biology, , Ed. Academic Press, 1999.