6Ross S.:The Economic Theory of Agency:The Principal's Problem[J]. American Economic Review, 1973 (63).
7Peng. Mike W. :Outside Directors and Fiml Performance During Institutional Transitions [J].Strategic Management Journal, 2004 (25).
8Eliezer M. Fich,Anil Shivdasani:The Impact of Stock-Option Compensation for Outside Directors on Firm Value [J].Joumal of Business, 2005 (78).
9Ling Jiang, Kenneth R. Ferris, Edward N. Coffman : The association between financially expert independent directors and the accounting for employee stock options [J].Research in Accounting Regulation, 2009 (21).