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A. Borisov, E.A.Bruevich, I.K.Rozgacheva, G.V.Yakunina, “Solar activity indices in 21, 22 and 23 cycles”, European Week of Astronomy and Space Science, JENAM-2011, Book of abstracts, 4-8 July 2011, Saint Petersburg, Russia, S3-4, p. 47.