Y.E. Shishkin1, A.V. Skatkov2
1Institute of Natural and Technical Systems, RF, Sevastopol, Lenin St., 28
2Sevastopol State University, RF, Sevastopol, Universitetskaya St., 33
E-mail: iurii.e.shishkin@gmail.com
DOI: 10.33075/2220-5861-2021-2-142-151