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@article{IM_1995__119_3_144257, author = {Alexander Lubotzky}, title = {Subgroup growth and congruence subgroups.}, journal = {Inventiones mathematicae}, pages = {267--296}, publisher = {mathdoc}, volume = {119}, number = {3}, year = {1995}, zbl = {0848.20036}, url = {http://geodesic.mathdoc.fr/item/IM_1995__119_3_144257/} }
Alexander Lubotzky. Subgroup growth and congruence subgroups.. Inventiones mathematicae, Tome 119 (1995) no. 3, pp. 267-296. http://geodesic.mathdoc.fr/item/IM_1995__119_3_144257/