@article{MZ_1953__58_169366,
     author = {Martin Kneser},
     title = {Absch\"atzung der asymptotischen {Dichte} von {Summenmengen.}},
     journal = {Mathematische Zeitschrift},
     pages = {459--484},
     publisher = {mathdoc},
     volume = {58},
     year = {1953},
     zbl = {0051.28104},
     url = {http://geodesic.mathdoc.fr/item/MZ_1953__58_169366/}
}