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. 2019 May 30;8(6):giz053. doi: 10.1093/gigascience/giz053

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© The Author(s) 2019. Published by Oxford University Press.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 16: — The mean number of citations [Citation Number/Documents Number (2 years)] over time. The mean number of citations values have almost doubled in the past 18 years; additionally, their distributions have changed considerably.