@article{MAN_1956__131_160496,
     author = {H.-J. Kanold},
     title = {Eine {Bemerkung} \"uber die {Menge} der vollkommenen {Zahlen.}},
     journal = {Mathematische Annalen},
     pages = {390--392},
     publisher = {mathdoc},
     volume = {131},
     year = {1956},
     zbl = {0072.03701},
     url = {http://geodesic.mathdoc.fr/item/MAN_1956__131_160496/}
}