@article{CMH_1950__24_138999,
     author = {B. Eckmann and E.R. Br\"andli},
     title = {Cartes{\'\i}sches und {Alexandersches} {Produkt} in der {Cohomologietheorie.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {68--72},
     publisher = {mathdoc},
     volume = {24},
     year = {1950},
     zbl = {0039.19001},
     url = {http://geodesic.mathdoc.fr/item/CMH_1950__24_138999/}
}