@article{MZ_1956__66_169627,
     author = {Friedrich Kasch},
     title = {Absch\"atzung der {Dichte} von {Summenmengen.} {III.}},
     journal = {Mathematische Zeitschrift},
     pages = {164--172},
     publisher = {mathdoc},
     volume = {66},
     year = {1956},
     zbl = {0073.03103},
     url = {http://geodesic.mathdoc.fr/item/MZ_1956__66_169627/}
}