%0 Journal Article %A Kurt Girstmair %T Generalized Dedekind sums, correlation of $L$-series, and the Galois module of $\cot(\pi/{}N)\cot(m\pi/{}N)$ %J Acta Arithmetica %D 2003 %P 69-89 %V 107 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/aa107-1-6/ %R 10.4064/aa107-1-6 %G en %F 10_4064_aa107_1_6