@article{CMH_1940__13_138765,
     author = {Heinz Hopf},
     title = {\"Uber den {Rang} geschlossener {Liescher} {Gruppen.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {119--143},
     publisher = {mathdoc},
     volume = {13},
     year = {1940},
     zbl = {0024.08601},
     url = {http://geodesic.mathdoc.fr/item/CMH_1940__13_138765/}
}