@article{GDZPPN002396920,
title = {On non-Euclidean crystallographic groups.},
journal = {Mathematische Zeitschrift},
volume = {93},
year = {1966},
pages = {87-102},
zbl = {0166.02602},
url = {http://dml.mathdoc.fr/item/GDZPPN002396920}
}
Wilkie, H.C. On non-Euclidean crystallographic groups.. Mathematische Zeitschrift, Tome 93 (1966) pp. 87-102. http://gdmltest.u-ga.fr/item/GDZPPN002396920/