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@article{IM_1988__93_2_143594, author = {D. Segal and F.J. Grunewald and G.C. Smith}, title = {Subgroups of finite index in nilpotent groups.}, journal = {Inventiones mathematicae}, pages = {185--224}, publisher = {mathdoc}, volume = {93}, number = {2}, year = {1988}, zbl = {0651.20040}, url = {http://geodesic.mathdoc.fr/item/IM_1988__93_2_143594/} }
D. Segal; F.J. Grunewald; G.C. Smith. Subgroups of finite index in nilpotent groups.. Inventiones mathematicae, Tome 93 (1988) no. 2, pp. 185-224. http://geodesic.mathdoc.fr/item/IM_1988__93_2_143594/