7Abd-el-Rahman, K. S. (1991). Firms competitive and national comparative advantages as joint determinants of trade competition. Weltwirtschaftliches Archiv, 127(1).
8Azhar, Elliott (2006). On the Measurement of Product Quality. Review of World Economics . Vol. 142 (3).
9Bruelhart, M. (1994). Marginal Intra-Industry Trade: Measurement and Relevance for the Pattern of Industrial Adjustment. Weltwirtschaftliches Archiv 130 (3).
10Fontagne, L., & Freudenberg, M. (1997). Intra-Industry Trade: Methodological Issues Reconsidered, CEPII working paper 97/02.