%0 Journal Article %T Oligocene CO2 Decline Promoted C4 Photosynthesis in Grasses %A Christin, Pascal-Antoine %A Besnard, Guillaume %A Samaritani, Emanuela %A Duvall, Melvin R. %A Hodkinson, Trevor R. %A Savolainen, Vincent %A Salamin, Nicolas %A , %J Current Biology %@ 0960-9822 %D 2008-01-01 %I Elsevier BV %~ DeepDyve