Pokhitonov, Yu. A.
Article History
Received: 22 January 2019
Revised: 15 April 2019
Accepted: 21 April 2019
First Online: 12 May 2020
FUNDING
: This work was financially supported by a grant competition for university students located in St. Petersburg, graduate students of universities, industry and academic institutions located in St. Petersburg (PSP no. 18505).
: The authors declare that they have no conflict of interest.