8Ensign P C. Interrelationships and horizontal strategy to achieve synergy and competitive advantage in the diversified firm[J]. Management Decision, 1998,36 (10) :657 - 668.
9Porter M. Competitive advantage : creating and sustaining superior performance [M]. New York : Free Press, 1985.
10Polanyi K. The great transform action: the political and economic origins of our times [M]. Boston, MA:Beacon Press, 1944.