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Authors
Draganov, Borislav R. https://orcid.org/0000-0003-4972-378X
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Funding
Funding for this research was provided by:
Fund for Scientific Research of the Bulgarian Ministry of Education and Science (DN 02/14)
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Article History
Received: 16 March 2020
Accepted: 21 September 2020
First Online: 1 October 2020
