@article{JIS_2007__10_9_a3,
     author = {Bordell\`es,  Olivier},
     title = {Mean values of generalized gcd-sum and lcm-sum functions},
     journal = {Journal of integer sequences},
     year = {2007},
     volume = {10},
     number = {9},
     zbl = {1174.11303},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2007__10_9_a3/}
}