Murphy, B. H.; Farley, K. A.; Zachos, J. C. (2010): An extraterrestrial (super 3) He-based time scale for the Paleocene-Eocene Thermal Maximum (PETM) from Walvis Ridge, IODP Site 1266. Elsevier, New York, NY, International, Geochimica et Cosmochimica Acta, 74 (17), 5098-5108, georefid:2011-023879