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@article{CMH_1972__47_139531, author = {F. Bachmann and L. Gr\"unenfelder}, title = {Homological {Methods} and the {Third} {Dimension} {Subgroup}}, journal = {Commentarii mathematici Helvetici}, pages = {526--531}, publisher = {mathdoc}, volume = {47}, year = {1972}, zbl = {0254.20036}, url = {http://geodesic.mathdoc.fr/item/CMH_1972__47_139531/} }
F. Bachmann; L. Grünenfelder. Homological Methods and the Third Dimension Subgroup. Commentarii mathematici Helvetici, Tome 47 (1972), pp. 526-531. http://geodesic.mathdoc.fr/item/CMH_1972__47_139531/