@article{10_4064_aa109_2_1,
     author = {Matthias Beck},
     title = {Dedekind cotangent sums},
     journal = {Acta Arithmetica},
     pages = {109--130},
     year = {2003},
     volume = {109},
     number = {2},
     doi = {10.4064/aa109-2-1},
     language = {de},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa109-2-1/}
}