@article{IM_1980__58_142719,
     author = {Pierre H. B\'erard},
     title = {Spectres et groupes cristallographiques {I:} {Domaines} euclidiens.},
     journal = {Inventiones mathematicae},
     pages = {179--200},
     publisher = {mathdoc},
     volume = {58},
     year = {1980},
     zbl = {0434.35068},
     url = {http://geodesic.mathdoc.fr/item/IM_1980__58_142719/}
}