3A.A. Gilbert, 1975. Note on the Incidence of Development in the Vicinity of a Growth Centre. Regional Studies.
4Meeus, M.,L. Oedemans, 1999. Regianal Systems of Innovation frbom within- A Nempirlcal Specification of the Relation hetween Technological Dynamics and Interaction between Multiple Actors in a Dutch Region.Eindoven Centre for Innovation Studies,The Netherlands Working Paper.
5L. Oerlemans,1996.The Embedded Firm:Innovation in Industrial Networks(In Dutch).Tilburg:Tilburg University Press.
6A. Dixit, J. E. Stiglitz,1977.Monopolistic Competition and Optimum Product Diversity.American Economic Review,Vol.67(3).
