Nie, Junsheng; King, John; Liu, Zhengyu; Clemens, Steve; Prell, Warren; Fang Xiaomin (2008): Surface-water freshening; a cause for the onset of North Pacific stratification from 2.75 Ma onward?. Elsevier, Amsterdam, Netherlands, Global and Planetary Change, 64 (1-2), 49-52, georefid:2009-022726