About the Authors
- Robert R. Wilkinson
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Affiliation Department of Mathematical Sciences, The University of Liverpool, Liverpool, United Kingdom
- Kieran J. Sharkey
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* E-mail: kjs@liv.ac.uk
Affiliation Department of Mathematical Sciences, The University of Liverpool, Liverpool, United Kingdom
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Wrote the paper: KJS RRW. Performed the research: KJS RRW.