@article{AMI_2002_29_a3,
     author = {Aleksander Grytczuk},
     title = {Note on {Ramanujan} sums},
     journal = {Annales mathematicae et informaticae},
     pages = {41--46},
     year = {2002},
     volume = {29},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AMI_2002_29_a3/}
}