Stishov, S. M.
Petrova, A. E.
Article History
Received: 20 January 2020
Revised: 20 January 2020
Accepted: 6 March 2020
First Online: 6 September 2020
ADDITIONAL INFORMATION
: This article was prepared for the special issue dedicated to the centenary of A.S. Borovik-Romanov.