9Jensen M C. W H Meckling. Theory of the Firm: Managerial Behavior,Agency Cost and Ownership Structure [ J]. Journal of Financial Economics,1976,3(4) :305 -360.
10Shleifer A, Vishny R. Management Entrenchment, the Case of Manager - specific Investments [ J ] . Journal of Financial Economics, 1989(25) :123 -139.