Keyword: «textbook»

Authors:

Sandal Spiridonov,

Sardana Prokopeva

Periodical scientific and methodological electronic journal “Koncept” is the official edition,
which is registered as media (registration Эл № 77-78575 issued 08.07.2020).
Editorial opinion can differ from opinion of authors. If reprinted, the reference to the journal is required.
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