Landais, A.; Steffensen, J.P.; Caillon, N.; Jouzel, J.; Masson-Delmotte, V.; Schwander, J. (2004). Evidence for stratigraphic distortion in the Greenland Ice Core Project (GRIP) ice core during Event 5e1 (120 kyr BP) from gas isotopes. J. Geophys. Res., 109.