8Allan Webster,Philip Hardwick.International Trade in Finan-cial Service.The Service Industries Journal,2005,12:721-746.
9Ana Bobirca,Paul-Gabriel Miclaus.A Multilevel Comparative Assessment Approach to International Services Trade Competi-tiveness:The Case of Romania and Bulgaria.World Academy of Science,2007,11:1-6.
10Balassa.Trade Liberalization and Revealed Comparative Ad-vantage.The Manchester School of Economic and Social Stud-ies,1965,44:99-123.