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. 2013 Jun 26;8(6):e66938. doi: 10.1371/journal.pone.0066938

Figure 6. Bibliographic coupling networks, in Fruchterman-Reingold layout, with node size proportional to degree, and edge size and colour reflecting weight (i.e. number of shared references between any two papers: blue = 1; yellow =  ≥2; red ≥5).

Figure 6

Numbers report average degree, modularity and average path length. Classification based on journal, following the systems of Essential Science Indicators and Arts & Humanities Science Citation Index: ma  =  mathematics; sp  =  Space Science; ph =  Physics; ch  =  Chemistry; mb  =  Molecular Biology; bb  =  Biology & Biochemistry; pa  =  Plant and Animal Sciences; ee  =  Environment/Ecology; pp  =  Psychiatry/Psychology; eb  =  Economics & Business; so  =  Social Sciences, general; ah  =  Arts & Humanities. High-resolution images available from the authors. [Data sourced from Thomson Reuters Web of Knowledge].