4Beaudry, C. and S. Breschi, 2003. ' Are Firms in Clusters Really More Innovative?', in: Economics of Innovation & New Technology, Vol. 12, No. 4, pp. 325- 342.
5Goldberg, Michael A, Helsley, Robert W and Levi, Maurice D., 1988. ' On the development of international centers' ,Annals of Regional Science February, Volume 22, 81 - 94 .
6Porter, M. E, 1998a. 'Clusters and Competition: New Agendas for Companies, Governments, and Institutions',In: On Competition, Baston: Harvard Business School. Press.
7H. C. Reed. 1981. 'The Per-cminence of International Financial Centres' ,Praeger, New York.
8D. Scholey., 1986. ' Essential features of International Financial Centres', Paper given at the International Banking Summer School, Switzerland.
9Solvell, O., G. Lindqvist, and C. Ketels, 2003,. 'The Cluster Initiative Greenbook' ,The Competitiveness Institute (TCI)/Vinnova: Gothenburg.
10Williarmon, Oliver E., 1989. 'Transaction Cost Economics' ,in R. Schmalensee and R.D. Willig (eds.) Handbook of Industrial Organization, New York: Elsevier Science Publishers, 136 - 182.