长三角地区城市国际化水平研究——基于来华外国人手机国际漫游信令数据
李兆中, 甄峰, 秦萧

A study on the level of urban internationalization in the Yangtze River Delta: Based on international roaming mobile signaling data of foreigners in China
LI Zhaozhong, ZHEN Feng, QIN Xiao
图4 2018年9月长三角外国人流动联系强度
Fig. 4 Foreigners' flow network connection intensity in the Yangtze River Delta in September 2018