4Rosenstein, Stuart, and J. G. Wyatt. Onside Directors, Board Independence, and Shareholder wealth [J]. Journal of Financial Economic, 26, 1990. pp157~191.
5Lee, Yung sheng, Rosenstein. Stuart, J. G. Wyatt. The Value of Financial Outside Directors on Corporate Boards [J]. International Review of Economics & Financial, 8, 1999, pp421~431.
6Fama, E. F, and Michoel C. Jensen. Separation of Ownership and Control [J]. The Journal of law and Economics, 26, June, 1983, pp301~325.