[1] LUBICH C.Convolution Quadrature and Discretized Operational Calculus I [J].Numer. Math.,1988,52:129-145.[2] LUBICH C.Convolution Quadrature and Discretized Operational Calculus II [J].Numer. Math.,1988,52:412-425.[3] XU Da.On the Discretization in Time for a Parabolic Integrodifferential Equation with a Weakly Singular Kernel I:Smooth Initial Data [J].Appl. Math. Comp.,1993,58:1-27.[4] 钟玉泉.复变函数论 [M].北京:高等教育出版社,1987.