Aktsipetrov, O. A.
Nikulin, A. A.
Ekimov, A. I.
Article History
Received: 4 February 1992
Revised: 4 February 1992
Accepted: 11 February 1992
First Online: 11 December 2023
CONFLICT OF INTEREST
: The authors of this work declare that they have no conflicts of interest.