Authors: Shaun A Marcott; Peter U Clark; Laurie Padman; Gary P Klinkhammer; Scott R Springer; Zhengyu Liu; Bette L Otto-Bliesner; Anders E Carlson; Andy Ungerer; June Padman; Feng He; Jun Cheng; Andreas Schmittner Journal: Proc Natl Acad Sci U S A Date: 2011-08-01 Impact factor: 11.205