Lu, G.; Keller, G. (1996): Separating ecological assemblages using stable isotope signals; late Paleocene to early Eocene planktic foraminifera, DSDP Site 577. Cushman Foundation for Foraminiferal Research, Ithaca, NY, United States, Journal of Foraminiferal Research, 26 (2), 103-112, georefid:1997-046905