@article{GDZPPN002064928, title = {Poincar\'e duality groups of dimension two, II.}, journal = {Commentarii mathematici Helvetici}, volume = {58}, year = {1983}, pages = {111-114}, zbl = {0518.57003}, url = {http://dml.mathdoc.fr/item/GDZPPN002064928} }
Eckmann, Beno; Linnell, Peter. Poincaré duality groups of dimension two, II.. Commentarii mathematici Helvetici, Tome 58 (1983) pp. 111-114. http://gdmltest.u-ga.fr/item/GDZPPN002064928/