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@article{CMH_1977__52_139696, author = {R. Strebel}, title = {A remark on subgroups of infinite index in {Poincar\'e} duality groups.}, journal = {Commentarii mathematici Helvetici}, pages = {317--324}, publisher = {mathdoc}, volume = {52}, year = {1977}, zbl = {0365.20040}, url = {http://geodesic.mathdoc.fr/item/CMH_1977__52_139696/} }
R. Strebel. A remark on subgroups of infinite index in Poincaré duality groups.. Commentarii mathematici Helvetici, Tome 52 (1977), pp. 317-324. http://geodesic.mathdoc.fr/item/CMH_1977__52_139696/