@article{MAN_1928__100_159311,
     author = {W. ACKERMANN},
     title = {\"Uber die {Erf\"ullbarkeit} gewisser {Z\"ahlausdr\"ucke}},
     journal = {Mathematische Annalen},
     pages = {638--649},
     publisher = {mathdoc},
     volume = {100},
     year = {1928},
     zbl = {54.0057.01},
     url = {http://geodesic.mathdoc.fr/item/MAN_1928__100_159311/}
}