Reference
Simon D Haenens, Andre Bornemann, Kaat Roose, Philippe Claeys, Robert Speijer (2012): Stable isotope paleoecology ((x13C and X18O) of early Eogene Zeauvigerina aegyptiaca from the North Atlantic (DSDP Site 401). – Austrian Journal of Earth Sciences – 105_1: 179 - 188.