Sabirzyanov, A. N.
Kirillova, A. N.
Article History
Received: 23 October 2019
Revised: 27 November 2019
Accepted: 18 December 2019
First Online: 16 September 2020
Change Date: 9 November 2020
Change Type: Update
Change Details: The TeX presentation of formulas was updated in HTML file.
Change Date: 3 December 2020
Change Type: Erratum
Change Details: An Erratum to this paper has been published:
Change Details: https://doi.org/10.3103/S1068799820030356