4Ramirez-Beltran N D. William K M Lau, et al. Empirical probability models to predict precipitation levels over Puerto Rico Stations [J]. Monthly Weather Review, 2007, 135 (3) 877-890.
5Peel S,Wilson L J. Modeling the distribution of precipitation forecasts from the canadian ensemble prediction system using kernel density estimation [J]. Weather and Forecasting, 2008, 23(4) : 575 595.
6Gray B H. On the stability of temperature eigenveetors pttern [J]. J Clirnataology, 1981, 1:273-281.