@article{10_4064_aa152_1_1,
     author = {T. H. Chan and A. V. Kumchev},
     title = {On sums of {Ramanujan} sums},
     journal = {Acta Arithmetica},
     pages = {1--10},
     publisher = {mathdoc},
     volume = {152},
     number = {1},
     year = {2012},
     doi = {10.4064/aa152-1-1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa152-1-1/}
}