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根据引文年代分布的基本数学模型——负指数模型、Ｂｒｏｏｋｓ模型和Ｂｕｒｔｏｎ－Ｋｅｂｌｅｒ方程，确定文献半衰期，并结合实例进行计算和比较。
According to the basic mathematics model of negative citation distribution - negative exponential model, Brooks model and Burton-Kebler equation, the literature half-life is determined and compared with examples.