On a sum involving the Euler function
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2006 ◽
Vol 17
(4)
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pp. 611-625
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2009 ◽
Vol 52
(1)
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pp. 3-8
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2007 ◽
Vol 50
(3)
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pp. 563-569
2001 ◽
Vol 48
(1-2)
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pp. 159-166
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2012 ◽
Vol 93
(1-2)
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pp. 85-90
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