5Eli Ofek and David Yermack.Taking Stock: does Equity - based Compensation Increase Managers'Ownership [M] . University of Michigan Press, 1997.
6Field L C,Hanka G. The Expiration of IPO Share Lockups[J]. Journal of Finance,2001 ,(56) :471-500.
7Aggarwal R K,Krigman L, Womack K L Strategic IPO Underpricing,Information Momentum,and Lockup Expiration Selling[J]. Journal ofFinancial Economics ,2002, (66) : 105-137.
8Gao Y. Trading and the Information Environment of IPO Stocks around Lockup Expiration:Evidence from Intraday Data[Z]. SSRN WorkingPaper, 2005.
9FamaE F. Agency Problems and the Theory of the Firra[J]. Journal of Political Economy,1980,(88〉:288-307.
10Jensen M C,Meckling W H. Theory of the Firm: Managerial Behavior, Agency Costs and Ownership Structure[J]. Journal of FinancialEconomics, 1970 ,(3) :305-360.