[3] Macrander A. Fractal inequality: A social network analysis of global and regional international student mobility[J]. Research in Comparative & International Education, 12, 243-268(2017).

[4] Perkins R, Neumayer E. Geographies of educational mobilities: Exploring the uneven flows of international students[J]. Geographical Journal, 180, 246-259(2014).

[5] Börjesson M. The global space of international students in 2010[J]. Journal of Ethnic & Migration Studies, 43, 1256-1275(2017).

[6] Barnett G A, Wu R Y. The international student exchange network: 1970 & 1989[J]. Higher Education, 30, 353-368(1995).

[17] Ducruet C, Cuyala S, Hosni A E. Maritime networks as systems of cities: The long-term interdependencies between global shipping flows and urban development (1890-2010)[J]. Journal of Transport Geography, 66, 340-355(2018).

[28] Shields R. Globalization and international student mobility: A network analysis[J]. Comparative Education Review, 57, 609-636(2013).

[29] Kondakci Y, Bedenlier S, Zawacki-Richter O. Social network analysis of international student mobility: Uncovering the rise of regional hubs[J]. Higher Education, 75, 1-19(2018).

[30] Barnett G A, Lee M, Ke J et al. The flow of international students from a macro perspective: A network analysis[J]. Compare A Journal of Comparative & International Education, 46, 1-27(2015).

[31] Vögtle E M, Windzio M. Networks of international student mobility: Enlargement and consolidation of the European transnational education space?[J]. Higher Education, 72, 1-19(2015).

[32] John D. Nystuen, Michael F. Dacey. A graph theory interpretation of nodal regions[J]. Papers of the Regional Science Association, 7, 29-42(1961).

[34] Chen T M, Barnett G A. Research on international student flows from a macro perspective: A network analysis of 1985, 1989 and 1995[J]. Higher Education, 39, 435-453(2000).