@article{MAN_1937__114_159901,
     author = {C.L. Siegel},
     title = {Die {Gleichung} a xn byn = c},
     journal = {Mathematische Annalen},
     pages = {57--68},
     publisher = {mathdoc},
     volume = {114},
     year = {1937},
     url = {http://geodesic.mathdoc.fr/item/MAN_1937__114_159901/}
}