П. Б. Демина
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Scientific Research Physicotechnical Institute, N. I. Lobachevskiĭ Nizhniĭ Novgorod State University, Nizhniĭ Novgorod
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Scientific Research Physicotechnical Institute, N. I. Lobachevskiĭ Nizhniĭ Novgorod State University, Nizhniĭ Novgorod