@article{05555890, title = {Discrete cocompact subgroups of the five-dimensional connected and simply connected nilpotent Lie groups.}, journal = {SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]}, volume = {5}, year = {2009}, doi = {10.3842/SIGMA.2009.020}, zbl = {1162.22011}, language = {en}, url = {http://dml.mathdoc.fr/item/05555890} }
Ghorbel, Amira; Hamrouni, Hatem. Discrete cocompact subgroups of the five-dimensional connected and simply connected nilpotent Lie groups.. SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only], Tome 5 (2009) . doi : 10.3842/SIGMA.2009.020. http://gdmltest.u-ga.fr/item/05555890/