8R. Vernon. International Investment and International Trade in the Product Cycle [J]. The Quarterly Journal of Eco- nomics, 1966, 80 (2).
9Nel, Etienne L., Trevor R Hill, Kate C Aitchison & Simphiwe Buthelezi.The Closure of Coal Mines and Local Development Responses in Coal-Rim Cluster, Northern KwaZulu-Natal, South Africa[J]. Development Southern Africa, Vol. 20, 2003,No. 3.
10Colker, James.Transformation of an Industrial City: High-tech Comes to Pittsburgh[J]. Management Review, 1985,May.