1. Late Neogene chronology: New perspectives in high-resolution stratigraphy Berggren, William A.; Hilgen, F. J.; Langereis, C. G.; Kent, Dennis V.; Obradovich, J. D.; Raffi, Isabella; Raymo, Maureen E.; Shackleton, N. J. 1995 Articles Paleontology
2. Paleogene geochronology: An integrated approach Aubry, Marie-Pierre; Berggren, William A.; Kent, Dennis V.; Flynn, John J.; Klitgord, K. D.; Obradovich, J. D.; Prothero, D. R. 1988 Articles Oceanography