4Ansoff,I.:Corporate Strategy-An Analytical Approach to Business Policy for Growth and Expansion,New York:Mc Graw-Hill,1965.
5Rumelt,R.P.:Strategy,Structure and Economic Performance Division of Research,Harvard Business School,Boston,MA,1974.
6Rumelt,R.P;Schendel,D.E.and Teece,D.J.:Fundamental Issues in Strategy:A Research Agenda,Boston:Harvard Business School Press,1994.
7Hoskisson,R.E and Hitt,M.A.:Antecedents and Performance Outcomes of Diversification:A Review and Critique of Theoretical Perspectives,Journal of Management,16(2):449-461,1990.