A Comparison of the Standardized Precipitation Evapotranspiration Index Using Thronthwaite and Penman-Monteith Parameterizations for Potential Evapotranspiration

McEvoy, D. J., Huntington, J. L., Abatzoglou, J. T. (2013). A Comparison of the Standardized Precipitation Evapotranspiration Index Using Thronthwaite and Penman-Monteith Parameterizations for Potential Evapotranspiration