Bralower, Timothy J.; Sliter, William V. (1991): Dysoxic/anoxic events in the Aptian-Albian (Middle Cretaceous). International Nannoplankton Association, The Hague, International, In: Young, J. R. (editor), International Nannoplankton Association; 4th conference; abstracts, 13 (2), 42-43, georefid:2006-060658