@article{01875749, title = {Discrete groups of affine isometries.}, journal = {Journal of Lie Theory}, volume = {9}, year = {1999}, pages = {321-349}, zbl = {1010.22019}, language = {en}, url = {http://dml.mathdoc.fr/item/01875749} }
Abels, Herbert. Discrete groups of affine isometries.. Journal of Lie Theory, Tome 9 (1999) pp. 321-349. http://gdmltest.u-ga.fr/item/01875749/