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@article{CMH_1974__49_139594, author = {Robert Bieri and Benno Eckmann}, title = {Amalgamated {Free} {Products} of {Groups} and {Homological} {Duality}}, journal = {Commentarii mathematici Helvetici}, pages = {460--478}, publisher = {mathdoc}, volume = {49}, year = {1974}, zbl = {0304.20034}, url = {http://geodesic.mathdoc.fr/item/CMH_1974__49_139594/} }
Robert Bieri; Benno Eckmann. Amalgamated Free Products of Groups and Homological Duality. Commentarii mathematici Helvetici, Tome 49 (1974), pp. 460-478. http://geodesic.mathdoc.fr/item/CMH_1974__49_139594/