@article{MZ_1921__10_167633,
     author = {H., Weyl},
     title = {Zur {Absch\"atzung} von ?(1+ti)},
     journal = {Mathematische Zeitschrift},
     pages = {88--101},
     year = {1921},
     volume = {10},
     zbl = {48.0346.01},
     url = {http://geodesic.mathdoc.fr/item/MZ_1921__10_167633/}
}