Ekimov, A. I.
Onushchenko, A. A.
Éfros, Al. L.
Article History
Received: 31 January 1986
Revised: 31 January 1986
Accepted: 5 February 1986
First Online: 11 December 2023
CONFLICT OF INTEREST
: The authors of this work declare that they have no conflicts of interest.