Reference:Zhao et al. 1995
From Global Warming Art
Zhao, M., N.A.S. Beveridge, N.J. Shackleton, M. Sarnthein, and G. Eglinton (1995). "Molecular stratigraphy of cores off northwest Africa: Sea surface temperature history over the last 80 ka". Paleoceanography 10 (3): 661-675.
The following pages on Global Warming Art refer to this reference: