8Falvey,D,and H.Kierzkowski (1987) "Product Quality,Intra-industry Trade and (Im)Perfect Competition",In H..Kierzkowski (ed),Protection and Competition in International Trade.Essays in Honor of W.M.Corden.Oxford.
9Greenaway,D.,Hine,and Ch.Milner (1994)"Country-specific Factors and the Pattern of Horizontal and Vertical Intra -industry Trade in the UK".Weltwirtschaftliches Archiv 130(1).78-100.
10Grnbel,H.G.and P.J.Lloyd (1975),"Intra-Industry Trade.The Theory and Measurement of International Trade in Differentiated Products",London.Macmillan.
