@article{JOLT_2004_14_2_a0,
     author = {E. Leuzinger},
     title = {Tits {Geometry,} {Arithmetic} {Groups,} and the {Proof} of a {Conjecture} of {Siegel

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     journal = {Journal of Lie Theory},
     pages = {317--338},
     year = {2004},
     volume = {14},
     number = {2},
     zbl = {1086.53073},
     url = {http://geodesic.mathdoc.fr/item/JOLT_2004_14_2_a0/}
}