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@article{MZ_1991__207_2_174265, author = {D.D. Long and G.A. Niblo}, title = {Subgroup separability and 3-manifold groups.}, journal = {Mathematische Zeitschrift}, pages = {209--216}, publisher = {mathdoc}, volume = {207}, number = {2}, year = {1991}, zbl = {0711.57002}, url = {http://geodesic.mathdoc.fr/item/MZ_1991__207_2_174265/} }
D.D. Long; G.A. Niblo. Subgroup separability and 3-manifold groups.. Mathematische Zeitschrift, Tome 207 (1991) no. 2, pp. 209-216. http://geodesic.mathdoc.fr/item/MZ_1991__207_2_174265/