Schrader, H. J. (1977): Paleoecology of the late Neogene-Quaternary Black Sea; an opal phytoplankton study of DSDP Leg 42B. Geological Society of America (GSA), Boulder, CO, United States, The Geological Society of America, 90th annual meeting, 9 (7), 1162-1163, georefid:1978-038487