Berezhneva A. N. (Secondary school nb 5 named after N.O. Krivoshapkin, Yakutsk, Russia)
Golikov A. I. (North-Eastern Federal University, Yakutsk, Russia )
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Berezhneva A. N. (Secondary school nb 5 named after N.O. Krivoshapkin, Yakutsk, Russia)
Golikov A. I. (North-Eastern Federal University, Yakutsk, Russia )
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