Winter, A., Miller, T., Kushnir, Y., Sinha, A., Timmermann, A., Jury, M. R., Gallup, C., Cheng, H. and Edwards, R. L.: Evidence for 800years of North Atlantic multi-decadal variability from a Puerto Rican speleothem, Earth Planet. Sci. Lett., 308(1–2), 23–28, 2011.