Reference
Ault, T. R., Cole, J. E., Overpeck, J. T., Pederson, G. T., George, S. S., Otto-Bliesner, B., Woodhouse, C. A., & Deser, C. (2013). The Continuum of Hydroclimate Variability in Western North America during the Last Millennium. Journal of Climate, 26(16), 5863-5878. https://doi.org/10.1175/JCLI-D-11-00732.1