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Lookup NU author(s): Dr Brian Varian
This is the authors' accepted manuscript of an article that has been published in its final definitive form by Springer, 2020.
For re-use rights please refer to the publisher's terms and conditions.
Author(s): Varian BD
Publication type: Article
Publication status: Published
Online publication date: 16/10/2020
Acceptance date: 04/10/2019
Date deposited: 12/05/2021
ISSN (print): 1863-2505
ISSN (electronic): 1863-2513
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