@article{JIS_2007__10_3_a1,
     author = {Bordell\'es, Olivier},
     title = {A note on the average order of the gcd-sum function},
     journal = {Journal of integer sequences},
     publisher = {mathdoc},
     volume = {10},
     number = {3},
     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2007__10_3_a1/}
}