Romanova T.A.(Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk State University, Krasnoyarsk, Russia.)
Krasnov P.O.(Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk State University, Krasnoyarsk, Russia.)
Avramov P.V.(Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk State University, Krasnoyarsk, Russia.)