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- Retallack, G.J. (1997). Neogene Expansion of the North American Prairie. PALAIOS 12 (4): 380-390.
- Zachos, J.C. and Kump, L.R. (2005). Carbon cycle feedbacks and the initiation of Antarctic glaciation in the earliest Oligocene. Global and Planetary Change 47 (1): 51-66.
- Krijgsman, W. and Garcés, M.; Langereis, C.G.; Daams, R.; Van Dam, J.; Van Der Meulen, A.J.; Agustí, J.; Cabrera, L. (1996). A new chronology for the middle to late Miocene continental record in Spain. Earth and Planetary Science Letters 142 (3-4): 367-380.