@article{MAN_1934__109_159700,
     author = {A. Kurosch},
     title = {Die {Untergruppen} der freien {Produkte} von beliebigen {Gruppen}},
     journal = {Mathematische Annalen},
     pages = {647--660},
     publisher = {mathdoc},
     volume = {109},
     year = {1934},
     zbl = {0009.01004},
     url = {http://geodesic.mathdoc.fr/item/MAN_1934__109_159700/}
}