8knut koschatzky,30 years structural change:experience from Ruhr Area,8th conference of the network of spatial research institution in center and Eastem Europe,leipzig,24-25.10.2005.
9http://: www. metropole- ruhr. de.
10Keun Lee,Chaisung Lim. "Technological Regimes, Catching-Up and Leapfrogging: Findings From the Korean Industries". Research Policy, 2001, (30), p. 459.