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@article{MAN_1933__107_159618, author = {H. Ulm}, title = {Zur {Theorie} der abzahlbar-unendlichen {Abelschen} {Gruppen}}, journal = {Mathematische Annalen}, pages = {774--802}, publisher = {mathdoc}, volume = {107}, year = {1933}, zbl = {0006.15003}, url = {http://geodesic.mathdoc.fr/item/MAN_1933__107_159618/} }
H. Ulm. Zur Theorie der abzahlbar-unendlichen Abelschen Gruppen. Mathematische Annalen, Tome 107 (1933), pp. 774-802. http://geodesic.mathdoc.fr/item/MAN_1933__107_159618/