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@article{MOMA_1987__104_178353, author = {Bruno Zimmermann}, title = {Surfaces and the {Second} {Homology} of a {Group.}}, journal = {Monatshefte f\"ur Mathematik}, pages = {247--254}, publisher = {mathdoc}, volume = {104}, year = {1987}, url = {http://geodesic.mathdoc.fr/item/MOMA_1987__104_178353/} }
Bruno Zimmermann. Surfaces and the Second Homology of a Group.. Monatshefte für Mathematik, Tome 104 (1987), pp. 247-254. http://geodesic.mathdoc.fr/item/MOMA_1987__104_178353/