A.N. Petrov – Post-graduate Student, 

Peter The Great St. Petersburg Polytechnic University

E-mail: alexey-np@yandex.ru

V.V. Lebedev – Ph.D.(Phys.-Math.), Junior Research Scientist, 

Ioffe Physical-Technical Institute (St Petersburg)

E-mail: vladimir_l@mail.ru

A.V. Shamray – Dr.Sc.(Phys.-Math.), Leading Research Scientist, 

Peter The Great St. Petersburg Polytechnic University; 

Main Research Scientist, Head of Department, 

Ioffe Physical-Technical Institute (St Petersburg)

E-mail: achamrai@mail.ioffe.ru