4Fama,E,F. and .Jensen, M.C,Separation of Ownership and Control.Journal of Law and Economics.1983(25).pp. 301-325.
5Gibbons R,K .J.Murphy. Optimal incentive contracts in The presence of career concerns; theory and evidence[J].Journal of Political Economy,1992,100(3).
6Morck, R., Shleifer, A. and Vishny,R. Management Ownership and Market Valuation: AnEmpirical Analysis. Journal of Financial Economice.1988(20).pp.293-315.