Erbacher, Jochen; Huber, Brian T.; Norris, Richard D.; Markey, Molly (2001): Increased thermohaline stratification as a possible cause for an ocean anoxic event in the Cretaceous Period. Macmillan Journals, London, United Kingdom, Nature (London), 409 (6818), 325-327, georefid:2001-014627