M.V. Voitikova - Ph.D. (Phys.-Math.), Leading Research Scientist , Institute of Physics, National Academy of Sciences, , Minsk, Belarus. E-mail: voitikova@imaph.bas-net.by
R.V. Khursa - Ph.D. (Med.), Assoсiate Professor, Belarusian Medical State University, Minsk, Belarus. E-mail: Rvkhursa@tut.by