@article{CMH_1945__18_138881,
     author = {Beno Eckmann},
     title = {Der {Cohomologie-Ring} einer beliebigen {Gruppe.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {232--282},
     publisher = {mathdoc},
     volume = {18},
     year = {1945},
     zbl = {0061.40705},
     url = {http://geodesic.mathdoc.fr/item/CMH_1945__18_138881/}
}