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@article{MZ_1966__91_170507, author = {H.C. Wilkie}, title = {On {non-Euclidean} crystallographic groups.}, journal = {Mathematische Zeitschrift}, pages = {87--102}, publisher = {mathdoc}, volume = {91}, year = {1966}, zbl = {0166.02602}, url = {http://geodesic.mathdoc.fr/item/MZ_1966__91_170507/} }
H.C. Wilkie. On non-Euclidean crystallographic groups.. Mathematische Zeitschrift, Tome 91 (1966), pp. 87-102. http://geodesic.mathdoc.fr/item/MZ_1966__91_170507/