Lovis, W.A., Urquhart, G.R., Raviele, M.E., Hart, J.P., 2011. Hardwood Ash Nixtamalization May Lead to False Negatives for the Presence of Maize by Depleting Bulk delta13C in Carbonized Residues. Journal of Archaeological Science 38, 2726-2730. doi:10.1016/j.jas.2011.06.010