М.Е. Paramonov - Post-graduate Student, Kotelnikov IRE RAS. E-mail: paramonov@hitech.cplire.ru V.P.Koshelets - Dr.Sc. (Phys.-Math.), Professor, Head of Laboratory, Kotelnikov IRE RAS. E-mail: valery@hitech.cplire.ru E.B. Goldobin - Professor, Tubingen University, Germany. E-mail: gold@uni-tuebingen.de