The contact details of authors: | Balashnikova Angelika Veniaminovna, Candidate of Phys. & Math., I. Yakovlev Chuvash State Pedagogical University, Cheboksary, Russia.
Mironov Boris Gurevich, Dr. Sci. Phys. & Math., Professor, I. Yakovlev Chuvash State Pedagogical University, Cheboksary, Russia.
Mihailova Marina Vasilevna, Dr. Sci. Phys. & Math., Professor, I. Yakovlev Chuvash State Pedagogical University, Cheboksary, Russia.
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