Funding for this research was provided by:
Российский Фонд Фундаментальных Исследований (РФФИ) (19-45-703002)
National Research Tomsk Polytechnic University (VIU-OG-61/2019)
Text and Data Mining valid from 2020-01-01
Received: 1 May 2019
Accepted: 11 November 2019
First Online: 1 January 2020
: The authors declare that they have no competing interests.