1. Ai, Jianming, and Dagang Ke. 2007. Empirical study on the relationship between corporate comprehensive performance and diversification degree. Journal of Shanxi University of Finance and Economics 29:80–84.
2. Barney, J. 2002. Gaining and Sustaining Competitive Advantage. Reading, MA: Addison-Wesley.
3. Beijing Electromechanical General Factory. 1985. Main business with diversified operations. Enterprise Management 4:15.
4. Bernheim, B.D., and M.D. Whinston. 1990. Multi-market contract and collusive behaviour. Rand Journal of Economics 21(1):1–26.
5. Bethel, J., and Liebeskind. 1993. The Effects of ownership structure on corporate restructuring. Strategic Management Journal 14(3):5–31.