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@article{MZ_1991__206_1_174207, author = {R. Bieri and J.A. Hillmann}, title = {Subnormal subgroups of 3-dimensional {Poincar\'e} duality groups.}, journal = {Mathematische Zeitschrift}, pages = {67--70}, publisher = {mathdoc}, volume = {206}, number = {1}, year = {1991}, zbl = {0695.57001}, url = {http://geodesic.mathdoc.fr/item/MZ_1991__206_1_174207/} }
R. Bieri; J.A. Hillmann. Subnormal subgroups of 3-dimensional Poincaré duality groups.. Mathematische Zeitschrift, Tome 206 (1991) no. 1, pp. 67-70. http://geodesic.mathdoc.fr/item/MZ_1991__206_1_174207/