Russia

Belyaev SergeyNikitichSaratov State University, 410012, Russia, Saratov, Astrakhanskaya street, 83serg@sgu.ru

KuznetsovSergeyPetrovichSaratov Branch of Kotel’nikov Institute of Radio Engineering and Electronics of the Russian Academy of Sciences, 38, Zelenaya Str., Saratov 410019, Russiaspkuz@yandex.ru

YafarovRavil' KyashshafovichSaratov State University, 410012, Russia, Saratov, Astrakhanskaya street, 83pirpc@yandex.ru

Rokakh Alexander GrigorievichSaratov State University, 410012, Russia, Saratov, Astrakhanskaya street, 83rokakhag@sgu.ru

IshbulatovYuriiMikhailovichSaratov State University, 410012, Russia, Saratov, Astrakhanskaya street, 83ishbulatov95@mail.ru

IvlievaIrinaValer’evnaSaratov State University, 410012, Russia, Saratov, Astrakhanskaya street, 83babkov@sgu.ru

DavydovaNadezhdaAlexandrovnaInstitute of Physics, National Academy of Sciences of Ukraine, Prospect Nauky 46, Kyiv, UKRAINE, 03028 davydova@iop.kiev.ua

BabkovLevMikhailovichSaratov State University, 410012, Russia, Saratov, Astrakhanskaya street, 83babkov@sgu.ru

ChernavinaMariyaLeonidovnaSaratov State University, 410012, Russia, Saratov, Astrakhanskaya street, 83snake-naja@mail.ru

NovoselovaAnnaVladimirovnaSaratov State University, 410012, Russia, Saratov, Astrakhanskaya street, 83nusena1975@mail.ru

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