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D. Suryanarayana, R. Sitaramachandra Rao "On the average order of the function $E(x) = \sum\limits_{n \leqslant x} {\phi (n) - \frac{{3x^2 }}{{\pi ^2 }}} $," Arkiv för Matematik, Ark. Mat. 10(1-2), 99-106, (1972)
