@article{MAN_1924__91_159041,
     author = {H. K\"unneth},
     title = {\"Uber die {Torsionszahlen} von {Produktmannigfaltigkeiten}},
     journal = {Mathematische Annalen},
     pages = {125--134},
     publisher = {mathdoc},
     volume = {91},
     year = {1924},
     zbl = {50.0658.03},
     url = {http://geodesic.mathdoc.fr/item/MAN_1924__91_159041/}
}