Walker M, Johnsen S, Rasmussen SO, Steffensen JP, Popp T, Gibbard P, Hoek W, Lowe J, Andrews J, Björck S, Cwynar L, Hughen K, Kershaw P, Kromer B, Litt T, Lowe DJ, Nakagawa T, Newnham R, Schwander J.  The Global Stratotype Section and Point (GSSP) for the base of the Holocene Series/Epoch (Quaternary System/Period) in the NGRIP ice core.  Episodes 2008;31:264-267.  https://doi.org/10.18814/epiiugs/2008/v31i2/016