共 10 条
 
              [4]
            
             
            
                Services Trade, Regulation and Regional Integration: Evidence from Sectoral Data[J] . Erik Marel,Ben Shepherd.World Econ . 2013 (11)
              
              [9]
            
             
            
                Gravity with Gravitas: A Solution to the Border Puzzle[J] . James E. Anderson,Eric van Wincoop.The American Economic Review . 2003 (1)
              
              [10]
            
             
            
                http://www.oecd.org/trade/topics/services-trade/中的sectornotes .
              

