@article{GDZPPN002323931,
title = {On the Top Betti Number of Subgroups of SL(n,Z).},
journal = {Mathematische Annalen},
volume = {264},
year = {1983},
pages = {277-282},
zbl = {0505.20035},
url = {http://dml.mathdoc.fr/item/GDZPPN002323931}
}
Ash, Avner. On the Top Betti Number of Subgroups of SL(n,Z).. Mathematische Annalen, Tome 264 (1983) pp. 277-282. http://gdmltest.u-ga.fr/item/GDZPPN002323931/