Westerhold, Thomas; Roehl, Ursula; Raffi, Isabella; Fornaciari, Eliana; Monechi, Simonetta; Reale, Viviana; Bowles, Julie; Evans, Helen F. (2008): Astronomical calibration of the Paleocene time. Elsevier, Amsterdam, Netherlands, Palaeogeography, Palaeoclimatology, Palaeoecology, 257 (4), 377-403, georefid:2008-071818