7Grubel H ,Lloyd P J. Intra-industry trade :the theory and measure- ment of international trade in differentiated products[M]. London: Macmillan Press Ltd, 1975 : 281-290.
8Brillhart M. Marginal intra-industry trade: measurement and rele- vance for pattern of industrial adjustment[J]. Weltwirtschattliches Archiv, 1994,130 (3) : 600-613.
9Gereffi G. International trade and industrial upgrading in the apparel commodity chain[J]. J Int Econ, 1999 (48) :37-70.
