@article{MAN_1982__259_163648,
     author = {Peter Hahnel},
     title = {Eine {Absch\"atzung} der {Summe,} die in der {Mertens-Goldstein-Vermutung} auftritt.},
     journal = {Mathematische Annalen},
     pages = {505--518},
     publisher = {mathdoc},
     volume = {259},
     year = {1982},
     zbl = {0467.10029},
     url = {http://geodesic.mathdoc.fr/item/MAN_1982__259_163648/}
}