@article{JDM_1903__12_144872,
     author = {B. Kagan},
     title = {Nachtrag zum {Aufsatz} },
     journal = {Jahresbericht der Deutschen Mathematiker-Vereinigung},
     pages = {60--61},
     publisher = {mathdoc},
     volume = {12},
     year = {1903},
     zbl = {34.0535.12},
     url = {http://geodesic.mathdoc.fr/item/JDM_1903__12_144872/}
}