4Overman H G, Redding S, Venables A J. The economic geography of trade, production and income: A survey of empirics [J]. Journal of Industry ,2001,85(9) :48 -56.
5Britto J. Technological cooperation and collective learning in networks of firms: Systematization concepts and empirical evidence [ R]. Salvador: Anais Do XIX Encontro Nacional de Economia da ANPEC,2001.
6Yoguel G, Novick M, Marin A. Production networks: Linkages, innovation processes and social management technologies: A methodological approach applied to the Volkswagen case in Argentina automobile industrial [ R]. Copenhagen: Danish Research Unit Industrial Dynamics (DRUID), 2002.
7Andersson R, Quigley J M, Wilhelmsson M. Agglomeration and the spatial distribution of creativity [ J ]. Papers in Regional Science,2005,84 ( 3 ) :445 - 464.
8Morrison A. Gatekeepers of knowledge within industrial districts : Who they are, how they interact [ J ]. Region- al Studies,2008,42(6) :817 - 835.
9Hakkonsson S J. "Learning by importing" in global value chains: Upgrading and South-South strategies in the Ugandan pharmaceutical industry [ J]. Development South Africa,2009,26(3 ) :499 - 516.
10Schmitz H. Local upgrading in global chains: Recent findings [ R ]. Elsinore: DRUID Summer Conference, 2004.