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. 2012 Mar 7;7(3):e33339. doi: 10.1371/journal.pone.0033339

Figure 3. The distribution of references made in five natural science and three social science specialties.

Figure 3

A) astrophysics and astronomy, B) atmospheric science and meteorology, C) organic chemistry, D) biochemistry and molecular biology, E) neurology and neurosurgery, F) history, G) sociology and H) economics. The last three (F, G, H) are shown on a logarithmic scale for clarity (which explains why ‘distant’ references seem to be close to 100%). For the NMS, we compute the same distribution based on a subset of source articles (and their references) that contain only 5 authors or less (dashed gray lines).