@article{MAN_1959__138_160725,
     author = {B. Hornfeck},
     title = {\"Uber nat\"urliche {Zahlen,} deren {Primteiler} in mindestens k-ter {Potenz} auftreten.},
     journal = {Mathematische Annalen},
     pages = {442--450},
     publisher = {mathdoc},
     volume = {138},
     year = {1959},
     zbl = {0086.03406},
     url = {http://geodesic.mathdoc.fr/item/MAN_1959__138_160725/}
}