Fig. 2

Cooperation network of the publications from China. A Institutions co-occurred network. The size of nodes represents the counts that institutions occurred in articles retrieved. The thickness of the lines represents the co-occurred counts of the connected two institutions. Time is reflected in different colors. B Authors co-occurred network. The size of nodes represents the counts that authors occurred in articles retrieved. The thickness of the lines represents the co-occurred counts of the connected two authors. Time is reflected in different colors. C The geological distribution of the ten most published institutions in China. Most of the institutions are located in east coast regions. D Countries co-occurred network. The size of nodes represents the counts that countries occurred in articles retrieved. The thickness of the lines represents the co-occurred counts of the connected two countries. Time is reflected by different colors