E.I. Semernya – Post-graduate Student, 

Moscow Institute of Physics and Technology (State University)

E-mail: poshisholina @gmail.com

S.P. Skobelev – Dr.Sc.(Phys.-Math.), Leading Research Scientist, 

PJSC «Radiofizika» (Moscow); 

Associate Professor, Moscow Institute of Physics and Technology (State University) E-mail: s.p.skobelev@mail.ru