@article{GDZPPN002062526,
title = {A remark on subgroups of infinite index in Poincar\'e duality groups.},
journal = {Commentarii mathematici Helvetici},
volume = {52},
year = {1977},
pages = {317-324},
zbl = {0365.20040},
url = {http://dml.mathdoc.fr/item/GDZPPN002062526}
}
Strebel, R. A remark on subgroups of infinite index in Poincaré duality groups.. Commentarii mathematici Helvetici, Tome 52 (1977) pp. 317-324. http://gdmltest.u-ga.fr/item/GDZPPN002062526/