@article{BUMI_2005_8_8B_2_a9,
     author = {Vaccaro, M. Alessandra},
     title = {Unitary groups acting on hyperbolic substructures},
     journal = {Bollettino della Unione matematica italiana},
     pages = {431--436},
     publisher = {mathdoc},
     volume = {Ser. 8, 8B},
     number = {2},
     year = {2005},
     zbl = {1127.11031},
     mrnumber = {22826},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BUMI_2005_8_8B_2_a9/}
}