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2. The generalized gravity equation, monopolistic competition, and the factor-proportions theory in international trade;Bergstrand;The Review of Economics and Statistics,1989
3. Discrepancies between imports and exports in OECD foreign trade statistics;Blades,1985
4. Tariffs and capacity utilization by monopolistically competitive firms;Brown;Journal of International Economics,1991
5. The Michigan model of world production and trade;Deardorff,1986