3BaldwinJ R,W M Brown,Rigby D L. Agglomeration economies: Microdata panel esti-mates from Canadian manufacturing[I]. Journal of Regional Science, 2010,50(5) : 915-934.
4BriilhartM,Mathys N A. Sectoral agglomeration economies in a panel of European re-gions [J], Regional Science and Urban Economics,2008,38(4) : 348 - 362.
5DeLoecker J. Do exports generate higher productivity. Evidence from SloveniaCJlJournal of International Economics, 2007,73(1): 69 - 98.
6FernandesA M. Firm productivity in Bangladesh manufacturing industries[J]. WorldDevelopment, 2008,36(10) : 1725-1744.
7KimS,Gopinath M,Kim H. High productivity before or after exports. An empirical a-nalysis of Korean manufacturing firms [J], Journal of Asian Economics,2009,20(4):410-418.
8MartinP,Mayer T,Mayneris F. Spatial concentration and plant-level productivity inFrance[J]. Journal of Urban Economics,2011,69(2) : 182 - 195.