@article{MAN_1980__249_163390,
     author = {Avner Ash},
     title = {Cohomology of {Congruence} {Subgroups} of {SL} {(n,Z).}},
     journal = {Mathematische Annalen},
     pages = {55--74},
     publisher = {mathdoc},
     volume = {249},
     year = {1980},
     zbl = {0438.20035},
     url = {http://geodesic.mathdoc.fr/item/MAN_1980__249_163390/}
}