Affiliation: | 1. Research Center for Development of Far-Infrared Region, University of Fukui (FIR UF), Bunkyo 3-9-1, Fukui, 910-8507, Japan 2. Radiophysical Department, Nizhny Novgorod State University, Gagarin av., 23, 690005, Nizhny Novgorod, Russia 3. Institute of Applied Physics of the Russian Academy of Sciences (IAP RAS), 46 Ulyanov St., Nizhny Novgorod, 603600, Russia
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