Walker M, Head MJ, Berkelhammer M, Björck S, Cheng H, Cwynar L, Fisher D, Gkinis V, Long A, Lowe J, Newnham R, Rasmussen SO, Weiss H.  Formal ratification of the subdivision of the Holocene Series/Epoch (Quaternary System/Period): two new Global Boundary Stratotype Sections and Points (GSSPs) and three new stages/subseries.  Episodes 2018;41:213-223.  https://doi.org/10.18814/epiiugs/2018/018016