@article{MAN_1936__112_159839,
     author = {G. Gentzen},
     title = {Die {Widerspruchsfreiheit} der reinen {Zahlentheorie}},
     journal = {Mathematische Annalen},
     pages = {493--565},
     publisher = {mathdoc},
     volume = {112},
     year = {1936},
     zbl = {0169.30801},
     url = {http://geodesic.mathdoc.fr/item/MAN_1936__112_159839/}
}