Firth, John V. (1996): An uppermost Campanian to lower Maastrichtian organic-walled phytoplankton assemblage from the central Arctic Ocean, Core FL-533, Alpha Ridge. American Association of Stratigraphic Palynologists, Dallas, TX, United States, In: Goodman, David K. (editor), Abstracts of the proceedings of the Twenty-eighth annual meeting of the American Association of Stratigraphic Palynologists, 20, 239, georefid:1999-014107