Geodesic
Cohomology of Congruence Subgroups of SL (n,Z).
Mathematische Annalen, Tome 249 (1980), pp. 55-74.

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Mots-clés : congruence subgroups, cohomology groups, torsionfree normal subgroup, finite cell complex, chains and cochains, stabilizers of cells 
@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/}
}
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Avner Ash. Cohomology of Congruence Subgroups of SL (n,Z).. Mathematische Annalen, Tome 249 (1980), pp. 55-74. http://geodesic.mathdoc.fr/item/MAN_1980__249_163390/