1.Dana Jr.J.D.,1993, the organizational and scope of agents:regulating Multiproduct industries,journal of Economic Theory 89(2),234~246
2.Fudenberg,D.,Holmstrom,B., and Milgrom,b.,1990, short term contracts and long term agency relationships,journal of Economic Theory 51,1~31
3.Fudenberg,D.,and Tirole,J.,1990,Moral hazard and renegotiation in agency contracts,econometrica 58,1279~1320
4.Ma，C.,1991,adverse selection in dynamic moral hazard,Quarterly journal of Economic,255~275
5.Sinclair-desgane,1994,the first order approach to Multi signal principle agent problems,econometrica 62(2),459~465
6.Kofman,A.M.,andlawarree,J.,1993,collusion in Hierarchical agency,econometrica61(3),629~656

上次荷塘月色帮了很大的忙，在这里感谢您！