Brehmer, Y., Li, S.-C., Straube, B., Stoll, G., von Oertzen, T., Müller, V., et al. (2008). Comparing memory skill maintenance across the lifespan: Preservation in adults, increase in children. Psychology and Aging, 23(2), 227-238. doi:10.1037/0882-7974.23.2.227.