@article{MAN_1959__137_160684,
     author = {E. Wirsing},
     title = {Bemerkung zu der {Arbeit} \"uber vollkommene {Zahlen} in {Math.} {Ann.} 183, {S.431?438(1957).}},
     journal = {Mathematische Annalen},
     pages = {316--318},
     publisher = {mathdoc},
     volume = {137},
     year = {1959},
     zbl = {0084.04205},
     url = {http://geodesic.mathdoc.fr/item/MAN_1959__137_160684/}
}