6Prema-chandra Athukorala and Nobuaki Yamashita, (2006) "Production Fragmentation and Trade Integration: East Asia in a Global Context," North American Journal of Economics and Finance 17, 233-256.
7Balassa Bela.The Determinants of Intra- Industry Specialization in United States Trade[J]. Oxford Economic Review,Vol.38(2),1986.
8Greenaway David and Milner Chris.Country- Specific Factors and the Pattern of Horizontal and Vertical Intra-Industry Trade in the UK[J]. Weltwirt- schaftliches Archive,Vol.130,1994.
9Grubel Herbert and Lloyd Peter. Intra-Industry Trade:the Theory and the Measurement of Internatio- nal Trade in Differentiated Products[M].London: Macmillan, 1975.