Discrete Subgroups of the Lorentz Group.
Mathematica Scandinavica, Tome 10 (1962), pp. 85-107
@article{MS2_1962__10_165791,
author = {Leon Greenberg},
title = {Discrete {Subgroups} of the {Lorentz} {Group.}},
journal = {Mathematica Scandinavica},
pages = {85--107},
year = {1962},
volume = {10},
zbl = {0118.03902},
url = {http://geodesic.mathdoc.fr/item/MS2_1962__10_165791/}
}
Leon Greenberg. Discrete Subgroups of the Lorentz Group.. Mathematica Scandinavica, Tome 10 (1962), pp. 85-107. http://geodesic.mathdoc.fr/item/MS2_1962__10_165791/