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Oligocene CO2 decline promoted C4 photosynthesis in grasses.
Christin PA, Besnard G, Samaritani E, Duvall MR, Hodkinson TR, Savolainen V, Salamin N. Christin PA, et al. Curr Biol. 2008 Jan 8;18(1):37-43. doi: 10.1016/j.cub.2007.11.058. Epub 2007 Dec 20. Curr Biol. 2008. PMID: 18160293 Free article.