@article{GDZPPN002104091, title = {L-groups of crystallographic groups.}, journal = {Inventiones mathematicae}, volume = {88}, year = {1987}, pages = {571-602}, zbl = {0622.57022}, url = {http://dml.mathdoc.fr/item/GDZPPN002104091} }
Yamasaki, M. L-groups of crystallographic groups.. Inventiones mathematicae, Tome 88 (1987) pp. 571-602. http://gdmltest.u-ga.fr/item/GDZPPN002104091/