（1）题目：Preservation of certain classes of life distributions under Poisson shock models
作者：Fagiuoli, E. and Pellerey, F.
出处：Journal of Applied Probability 31(1994): 458–465
链接：http://www.jstor.org/pss/3215038

（2）题目：The survival probability in nite time period in fully discrete risk model
作者：Cheng, S.X. and  Wu, B.
出处：Applied Mathematics A journal of Chinese Universities Serve B, 14(1999): 67-74.
链接：http://www.springerlink.com/content/d1744713t6728518/

万分感谢！！！