English: Portrait of David Hilbert, Courtesy of the artist Anna Gorban, the cover image of the theme issue ‘Hilbert's sixth problem, Phil. Trans. R. Soc. A 2018 volume 376, issue 2118, https://royalsocietypublishing.org/toc/rsta/376/2118
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https://royalsocietypublishing.org/toc/rsta/376/2118 Cover image of the theme issue ‘Hilbert's sixth problem’ Phil. Trans. R. Soc. A 2018 376 20170238; DOI: 10.1098/rsta.2017.0238. Published 19 March 2018, was reviewed on 27 February 2021 by reviewerRubin16, who confirmed that it was available there under the stated license on that date.
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