【作者】George Philippidis1, Helena Resano-Ezcaray2, Ana I. Sanjuán-López3,*

【文题】Capturing zero-trade values in gravity equations of trade: an analysis of protectionism in agro-food sectors

【年份】2013.01

【全文链接或数据库名称(选填)】wiley online library

http://onlinelibrary.wiley.com/doi/10.1111/agec.12000/abstract