@article{PIM_1952_S_S_IV_04_a7,
     author = {Konrad Knopp},
     title = {Zwei {Abelsche} {S\"atze}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {89 },
     publisher = {mathdoc},
     volume = {_S_S_IV},
     number = {04},
     year = {1952},
     url = {http://geodesic.mathdoc.fr/item/PIM_1952_S_S_IV_04_a7/}
}