Fig. 6
A Mapping of the co-cited authors. (The 3029 points with different colors represent the 3029 cited references.) B Mapping of the co-cited journals. (The 1000 points with different colors represent the 1000 identified journals.) C Mapping of the co-cited references. The point sizes represent the citation frequency. The line between different points indicates that they were cited in one paper. The shorter the line, the closer the link between two papers. The same color of the points represents the same research area they belong to