@article{GDZPPN002054337, title = {Der Cohomologie-Ring einer beliebigen Gruppe.}, journal = {Commentarii mathematici Helvetici}, volume = {18}, year = {1945}, pages = {232-282}, zbl = {0061.40705}, url = {http://dml.mathdoc.fr/item/GDZPPN002054337} }
Eckmann, Beno. Der Cohomologie-Ring einer beliebigen Gruppe.. Commentarii mathematici Helvetici, Tome 18 (1945) pp. 232-282. http://gdmltest.u-ga.fr/item/GDZPPN002054337/