@article{SIGMA_2009_5_a19,
     author = {Amira Ghorbel and Hatem Hamrouni},
     title = {Discrete {Cocompact} {Subgroups} of the {Five-Dimensional} {Connected} and {Simply} {Connected} {Nilpotent} {Lie} {Groups}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2009},
     volume = {5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2009_5_a19/}
}