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. 2016 May 3;1:3. doi: 10.1186/s41073-016-0008-5

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© The Author(s) 2016

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — The 2015 citation network of the Narayan paper. The network is shown here as a combination of the 2014 network (blue) and the 2015 additions (red). As is Fig. 1, every nodestands for a paper and every arrowfor a citation relation. The Narayan paper is represented by the blue circle with the N inside