VOSviewer
Nees Jan van Eck and Ludo Waltman
VOSviewer
-cluster_colors
http://www.cwts.nl/projects/epsrc/cluster_colors.txt
-label_size_variation
0.35
-map
http://www.cwts.nl/projects/epsrc/EPSRC-MixF2-chemistry_medicinal_2006_2010_term_citation_impact_map.csv