About the Authors
- Cheng Ly
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* E-mail: chengly@math.pitt.edu (CL); bdoiron@math.pitt.edu (BD)
Affiliation Department of Mathematics, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
- Brent Doiron
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* E-mail: chengly@math.pitt.edu (CL); bdoiron@math.pitt.edu (BD)
Affiliation Department of Mathematics, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Wrote the paper: CL BD.