Geodesic
On the arithmetical functions and .
Portugaliae mathematica, Tome 53 (1996) no. 1, pp. 107-115.

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Keywords: maximal order, average order, number-theoretic inequalities, Jordan totient, divisor function, Dirichlet convolution, unitary convolution, normal order 
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     author = {S\'andor, J.},
     title = {On the arithmetical functions  and .},
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Sándor, J. On the arithmetical functions  and .. Portugaliae mathematica, Tome 53 (1996) no. 1, pp. 107-115. http://geodesic.mathdoc.fr/item/PORMA_1996__53_1_47618/