5BHAGWATI J N. 1984. Why are services cheaper in poor countries? [ J]. Economic Journal ,94:279 - 286.
6BURGESS D F. 1990. Services as intermediate goods: the issue of trade liberalization [ C ]//The Political Economy of International Trade: Essays in Honor of Robert E. Baldwin. Oxford and Cambridge: Blackwell.
7DEARDORFF A V. 1985. Comparative advantage and international trade and investment in services[ C ]//STERN R M. Trade and Investment in Services: CANADA/US Perspectives. Toronto:Ontario Economic Council.
8DICK R, DICKE H. 1979. Patterns of trade in knowledge [ C ]//GIERSCH H. International Eocnomic Development and Resources Transfer. Tubingen:J. C. B. Mohr.
9DJAJIC S, KIERZKOWSKI H. 1989. Goods, services and trade [ J ]. Economica, 56 : 83 - 95.
10FEKETEKUTY G. 1988. International trade in services:an overview and blueprint for negotiations [ M ]. Cambridge : Ballinher.
