I would like to thank my colleague Matt Grove for initial discussions of the potential value of references to an examination of disciplinary knowledge structures, Martin Wolf at the Library of the University of Liverpool for advice on the use of the Web of Science, Matthew Johnson for helpful comments on earlier drafts, and Ludo Waltman for detailed advice on aspects of clustering and mapping in VOSviewer. I would also like to thanks Tom Brughmans and another anonymous reviewer for their comments on the submitted draft.
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