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Suryanarayana, D., Sitaramachandra Rao, R. On the average order of the function\(E(x) = \sum\limits_{n \leqslant x} {\phi (n) - \frac{{3x^2 }}{{\pi ^2 }}} \) . Ark. Mat. 10, 99–106 (1972). https://doi.org/10.1007/BF02384804
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DOI: https://doi.org/10.1007/BF02384804