@article{MAN_1940__117_160047,
     author = {W. ACKERMANN},
     title = {Zur {Widerspruchsfreiheit} der {Zahlentheorie}},
     journal = {Mathematische Annalen},
     pages = {162--194},
     year = {1940},
     volume = {117},
     zbl = {66.0031.02},
     url = {http://geodesic.mathdoc.fr/item/MAN_1940__117_160047/}
}