83年现正讨论文件
现正讨论文件No. 2300
published in: Economics Letters, 2008, 98 (3), 235-239
现正讨论文件No. 2229
published as 'Genetic Distance, Transportation Costs, and Trade' in: Journal of Economic Geography, 2014, 14 (1), 179-198
现正讨论文件No. 2040
substantially revised version published in: Journal of Economic Behavior and Organization, 2009, 69 (3), 274-287
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