Vandyshev, Yu. V.
Dneprovskiĭ, V. S.
Ekimov, A. I.
Okorokov, D. K.
Popova, L. B.
Éfros, Al. L.
Article History
Received: 14 September 1987
Revised: 14 September 1987
Accepted: 22 September 1987
First Online: 11 December 2023
CONFLICT OF INTEREST
: The authors of this work declare that they have no conflicts of interest.