1. Lobachevsky State University of Nizhny Novgorod (National Research University), prosp. Gagarina 23, Nizhny Novgorod, 603950, Russian Federation
2. Scientific-Research Physicotechnical Institute at the Nizhnii Novgorod State University, prosp. Gagarina 23, korp. 3, Nizhnii Novgorod, 603600, Russian Federation