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Authors
Khovanova, Tanya http://orcid.org/0000-0003-0868-8981
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Article History
Received: 23 September 2008
Revised: 18 October 2019
Accepted: 19 October 2019
First Online: 5 November 2019
Compliance with Ethical Standards
:
: The author declare that she has no conflict of interest.
: The research is purely mathematical and didn’t involve any animal or human subjects.
