Forrest, M, Eronen, JT, Utescher, T, Knorr, G, Stepanek, C, Lohmann, G and Hickler, T (2015) Climate-vegetation modelling and fossil plant data suggest low atmospheric CO2 in the late Miocene. Climate of the Past, 11(12). 1701-1732. doi:10.5194/cp-11-1701-2015