8Amiti Mary, 1996, "International Trade in the Manufacturing Sectors of Industrialized Countries: Theory and Evidence",PHD Dissertation in Economics ,London School of Economics.
9Amiti Mary,1999, "Specialization Patterns in Europe",Weltwirtschaftliches Archiv, 134(4), pp.573~593.
10Brulhart Marius and Traeger Rolf, 2003, "An Account of Geographic Concentration Patterns in Europe".