Institution: | 1. Saratov Branch of Institute of Radio-Engineering and Electronics of RAS, Zelenaya, 38, 410019, Saratov, Russia 2. Department of Physics, The Technical University of Denmark, 2800 Kgs., Lyngby, Denmark 3. Saratov State Technical University, Polytechnicheskaya, 77, 410054, Saratov, Russia
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