@article{GDZPPN002063972,
title = {Poincar\'e duality groups of dimension two.},
journal = {Commentarii mathematici Helvetici},
volume = {55},
year = {1980},
pages = {510-520},
zbl = {0458.20048},
url = {http://dml.mathdoc.fr/item/GDZPPN002063972}
}
Eckmann, Beno; Müller, Heinz. Poincaré duality groups of dimension two.. Commentarii mathematici Helvetici, Tome 55 (1980) pp. 510-520. http://gdmltest.u-ga.fr/item/GDZPPN002063972/