6.Meek, G.K., Roberts, C.B. and Gray, S.J., Factors influencing voluntary annual report disclosures by US, UK and continental European multinational corporations [J].Joumal of International Busi- ness Studies, 1995, 3rd Quarter.
7Leftwich, R., Watts, R. and Zimmerman, J.Voluntary corporate disclosure: The case of interim reporting[J]. Journal of Accounting Research, 1981, Supp,19.
8Eng, L.L., Mak, Y.T., Corporate Governance and Voluntary Disclosure[J] .Jour- nal of Accounting and Policy, 2003, 22.
9Lang, M., Lundholm, R..Cross- sectional Determinants of Analyst Ratings of Corporate Disclosures[J] .Journal of Account- ingResearch, 1993, 12.
10Fama, E.F, Jensen.M.C., Separation of ownership and control[J].Journal of Law and Economics, 1983, 26 (6).