Gross, E. F.
Ekimov, A. I.
Razbirin, B. S.
Safarov, V. I.
Article History
Received: 22 June 1971
Revised: 22 June 1971
Accepted: 30 June 1971
First Online: 11 December 2023
CONFLICT OF INTEREST
: The authors of this work declare that they have no conflicts of interest.