@article{ELMA_1976__31_141178,
     author = {Heiko Harboth},
     title = {Eine {Bemerkung} zu den vollkommenen {Zahlen.}},
     journal = {Elemente der Mathematik},
     pages = {115--117},
     publisher = {mathdoc},
     volume = {31},
     year = {1976},
     zbl = {0336.10004},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1976__31_141178/}
}