@article{GT_2015_19_6_a2,
     author = {Calegari, Frank},
     title = {The stable homology of congruence subgroups},
     journal = {Geometry & topology},
     pages = {3149--3191},
     publisher = {mathdoc},
     volume = {19},
     number = {6},
     year = {2015},
     doi = {10.2140/gt.2015.19.3149},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/gt.2015.19.3149/}
}