1Anup Agrawal,charles lk. Knoeber. Performance and mechanisms to control agency Problems between managers and shareholders.Journal of Fnancial and Quantitive Analysis, 1996;6.
2Alehain,Armen A.H.Dernset Z..Produetion, Information Costs and Eeonomic Orgnization.American Eeonomic Review, 1972;12.