Lowell, T.V., Heusser, C.J., Andersen, B.G., Moreno, P.I., Hauser, A., Heusser, L., Schl¸chter, C., Marchant, D.R., and Denton, G.H., 1995, Interhemispheric correlation of late Pleistocene glacial events. Science 269, 1541-1549.