@article{10_4064_aa107_1_6,
     author = {Kurt Girstmair},
     title = {Generalized {Dedekind} sums, correlation of $L$-series,
 and the {Galois} module of $\cot(\pi/{}N)\cot(m\pi/{}N)$},
     journal = {Acta Arithmetica},
     pages = {69--89},
     publisher = {mathdoc},
     volume = {107},
     number = {1},
     year = {2003},
     doi = {10.4064/aa107-1-6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa107-1-6/}
}