Researches on regional economic integration of the Greater Pearl River Delta 并列题名：Researches on regional economic integration of the Greater Pearl River Delta Research on regional economic integration in northeast Asia Research on regional economic integration in Beibu gulf economic zone of Guangxi Research on regional economy integration of Yan-Long-Tu 并列题名：Research on regional economic integration in Beibu gulf economic zone of Guangxi Research report on the development of trade areas in pearl river delta Study on regional economic integration strategy in northeast Asia Study on international economic integration of the sub-region: theory and practice 并列题名：Research on regional economy integration of Yan-Long-Tu