粤港澳大湾区城市群知识多中心的演化过程与机理
马海涛,黄晓东,李迎成

The evolution and mechanisms of megalopolitan knowledge polycentricity of Guangdong-Hong Kong-Macao Greater Bay Area
MA Haitao,HUANG Xiaodong,LI Yingcheng
图7 不同时段GBA城市合作论文的分尺度比较
Fig. 7 Comparison of GBA cities' co-publications at different geographical scales at three time periods