@article{10_4064_cm100_1_10,
     author = {Shi-Chao Chen and Yong-Gao Chen},
     title = {On the average of the sum-of-$a$-divisors function},
     journal = {Colloquium Mathematicum},
     pages = {103--109},
     publisher = {mathdoc},
     volume = {100},
     number = {1},
     year = {2004},
     doi = {10.4064/cm100-1-10},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm100-1-10/}
}