4Berger J. Statistical decision theory and Bayesian analysis [ M]. 2nd ed. New York:Springer-Verlag, 1985:432-520.
5Brown L D, Cohen A, Samuel-Cahn E. A sharp necessary condition for admissibility of sequential tests-necessary and sufficient confidence for and miscibility of SPRT' s [ J ]. The Annual of Statistics, 1983, 11(2) : 640 - 653.
