1Adelman, M. A, 1955. The concept and statistical measurement of vertical integration, in G. J. Stigler, ed.,Business concentration and price policy (Princeton University Press,Princeton,NJ)281 - 322.
2Arrow ,K., 1975.Vertical integration and communication.the Bell Journal of Economics,6,173 - 183.
3Carlton, D. W,, 1979. Vertical integration in competitive markets under uncertainty. Journal of Industrial Economics, 27,189 - 209.
4Cave, R. E., Bradburd, R. M., 1988. The empirical determinants of vertical integration. Journal of Economic Behavior and Organization 9,265 - 279.
5Coase,R. H. ,1937. The nature of the firm. Economies 4,386 -405
6Davies,S.W. , Morris,C. ,1995.A new index of vertical integration: Some estimates for UK manufacturing.International Journal of Industrial Organization. Volume 13, Issue 2.
7Fan,Joseph P. H. ,2000. Price uncertainty and vertical integration: an examination of petrochemical finns .Journal of Corporate Finance. Volume 6,345 - 376.
8Feenstra, R. C., Yang, T, H., Hamilton, G. G.. 1999, Business groups and product variety in trade: evidence from South Korea,Tanwan and Japan.Journal of Internetional Economics. Volume 48, Issue 1.
9Gort, M., 1962,Diversification and integration in American industry, (priacetoa University Press, Princeton) .
10Hay, D, And H, Morries, 1991, Industrial economics and orgamzation:Theory and evidence, 2^nd ed. ( Oxford University Press ,Oxford)
