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. 2020 Jan 20;22(1):126. doi: 10.3390/e22010126

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Distance between books from the same author is significantly smaller than distance between books from different authors. For each author, the boxplots shows the $5, 25, 50, 75, 95$ -percentile of the distribution of distances from $1000$ pairs of books from the same author (green) and to a different author (gray).