@article{10_1090_S0894_0347_97_00234_8,
     author = {Ritter, J\"urgen and Weiss, Alfred},
     title = {Cohomology of units and {\ensuremath{\mathit{L}}-values} at zero},
     journal = {Journal of the American Mathematical Society},
     pages = {513--552},
     year = {1997},
     volume = {10},
     number = {3},
     doi = {10.1090/S0894-0347-97-00234-8},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-97-00234-8/}
}