6Rumelt, R.Strategy, Structure and Economic Performance[M]. Boston, MA. Harvard University Press, 1974.
7Montgomery, C.A.and B. WernerfeL. Diversification, Ricardian rents, and Tobin' s q Rand [J].Journal of Economies, 1988, (19):623- 630.
8Chatterjee, Sayan, James D. Blocher.Measurement of Firm Diversification: Is It Robust?[J].Academy of Management Journal, 1992, 35(4) : 874-888.
9Wrigley L.Divisional Autonomy and Diversification (Unpublished Doctoral Dissertation )[D].Cambridge, MA: Harvard Business School, 1970.
10H. Donald Hopkins.Acquisition and Divestiture as a response to Competitive Position and Market Structure[J]. Journal of Management Studies, 1991,28(6): 666-675.
